157 results on '"Walter Gams"'
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2. Clarifications needed concerning the new Article 59 dealing with pleomorphic fungi
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Walter Gams, Hans-Otto Baral, Walter M. Jaklitsch, Roland Kirschner, and Marc Stadler
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ANAMORPH ,KEW RULE ,LIST-DEMOTED GENERIC NAME ,NOMENCLATURE ,TELEOMORPH ,Botany ,QK1-989 - Abstract
The new rules formulated in Article 59 of the International Code of Nomenclature for algae, fungi, and plants (ICN) will cause numerous, often undesirable, name changes, when only phylogenetically defined clades are named. Our task is to name fungal taxa and not just clades. Two suggestions are made here that may help to alleviate some disadvantages of the new system. (1) Officially an epithet coined in a list-demoted genus that is older than the oldest one available in the list-accepted genus would have to be recombined in the accepted genus. We recommend that individual authors and committees establishing lists of protected names should generally not recombine older epithets from a demoted genus into the accepted genus, when another one from pre-2013 is available in that genus. (2) Because the concepts of correlated teleomorph and anamorph genera are often incongruent, enforced congruence leads to a loss of information. Retaining the most suitable generic name is imperative, even when this is subordinated to another, list-accepted, generic name. Some kind of cryptic dual generic nomenclature is bound to persist. We therefore strongly recommend the retention of binomials in genera where they are most informative. With these recommendations, the upheaval of fungal nomenclature ensuing from the loss of the former Art. 59 can be reduced to an unavoidable minimum.
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- 2012
3. «Phaeomoniella chlamydospora» Gen. et Comb. Nov., a Causal Organism of Petri Grapevine Decline and Esca
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Pedro W. Crous and Walter Gams
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Botany ,QK1-989 - Abstract
Phaeomoniella is proposed as a new hyphomycete genus to accommodate Phaeoacremonium chlamydosporum, the most important fungal organism associated to Petri grapevine decline. Morphologically the genus is similar to Phaeoacremonium, but is distinguished from the latter based on its cultural characteristics, conidiophore morphology, and its uniformly straight, and slightly pigmented conidia. Petri grapevine decline is seen as an important component of the esca disease complex of grapevines.
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- 2006
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4. The ascomycete genus Niesslia and associated monocillium-like anamorphs
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T. Gräfenhan, B. Stielow, Walter Gams, H.-J. Schroers, Westerdijk Fungal Biodiversity Institute, and Westerdijk Fungal Biodiversity Institute - Collection
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0106 biological sciences ,0303 health sciences ,biology ,Phylogenetic tree ,Hypocreales ,Phialide ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Agricultural and Biological Sciences (miscellaneous) ,030308 mycology & parasitology ,Ascocarp ,03 medical and health sciences ,Herbarium ,Genus ,Botany ,Internal transcribed spacer ,Lichen ,Ecology, Evolution, Behavior and Systematics - Abstract
The species of Niesslia including anamorphs formerly known as Monocillium form a distinct group in the Hypocreales and can be delimited by several unique morphological characters. Niesslia species inhabit decaying plant substrates, such as leaf litter or bark of diverse plants, especially coniferous hosts. Certain species occur on and may parasitize lichens, fruiting bodies of other fungi and even nematode eggs. Taxonomically, species of Niesslia are classified in the Niessliaceae. Niesslia species are recognised by their tiny superficial, mostly dark brown, shiny and typically spine covered ascomata. Monocillium-like phialides formed in situ and in culture are usually partly or entirely thick-walled. Phialides with wall thickening only in their basal parts sometimes expand in width to taper again into a conidiiferous neck, while others terminate in a non-sporulating vesicle. Based on the revised generic concept presented here, Niesslia accommodates 50 cultured species plus around 40 species known only from herbarium material. Some of the latter species may eventually have to be excluded from Niesslia but are maintained in the genus ad interim, until DNA sequences necessary for their accurate reclassification are available. The taxonomic concept based on morphological characters is corroborated by DNA sequences of phylogenetic marker loci such as the large subunit (28S) of the ribosomal RNA gene, internal transcribed spacer regions 1 and 2 including the 5.8S ribosomal RNA gene, and partial sequences of translation elongation factor 1-α, β-tubulin 2 and γ-actin genes. These DNA barcodes support most of the morphologically delimited species and the generic concept of Niesslia.
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- 2019
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5. An annotated checklist of epithets published in Verticillium and Acrostalagmus, some similar genera, and teleomorphs associated with verticillium-like anamorphs
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Walter Gams
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0301 basic medicine ,biology ,media_common.quotation_subject ,Plant Science ,030108 mycology & parasitology ,Verticillium ,biology.organism_classification ,Checklist ,03 medical and health sciences ,Acrostalagmus ,Botany ,Taxonomy (biology) ,Fungal morphology ,Epithet ,Nomenclature ,Ecology, Evolution, Behavior and Systematics ,media_common - Published
- 2017
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6. Disentangling Phialophora section Catenulatae: disposition of taxa with pigmented conidiophores and recognition of a new subclass, Sclerococcomycetidae (Eurotiomycetes)
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Walter Gams, Václav Štěpánek, Martina Réblová, and Wendy A. Untereiner
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0301 basic medicine ,Phylogenetic tree ,biology ,Chaetothyriomycetidae ,Phialide ,030108 mycology & parasitology ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,03 medical and health sciences ,Taxon ,Eurotiomycetes ,Evolutionary biology ,Polyphyly ,Botany ,Phialophora ,Ecology, Evolution, Behavior and Systematics ,Marine fungi - Abstract
A new genus Rhopalophora is described for Phialophora clavispora, a lignicolous species formerly placed in Phialophora section Catenulatae that possesses pigmented conidiophores, phialides with a single conidiogenous locus that occasionally appear as schizophialides, and clavate, aseptate conidia arranged in chains or sometimes in heads. Sexual morphs are not known for this taxon. Phylogenetic analysis of DNA sequences from five loci (nucSSU, ITS, nucLSU, mitSSU, rpb1 and rpb2) of this and related fungi supports the introduction of a new family, Sclerococcaceae, for which we establish the order Sclerococcales. This order belongs to the new subclass Sclerococcomycetidae, a strongly supported clade within the Eurotiomycetes that is basal to a lineage containing the Chaetothyriomycetidae, Coryneliomycetidae and Eurotiomycetidae. Rhopalophora clavispora fits in this new family and is closely related to an isolate of Fusichalara minuta. The Sclerococcales also encompass marine, lignicolous species of Dactylospora, two species of the lichenicolous genus Sclerococcum, and a lineage comprised of strains from the digestive tracts of Neotropical wood-inhabiting beetles. We confirm that Dactylospora is polyphyletic; the phylogenetic placement of D. parasitica, the generic type, remains unknown.
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- 2016
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7. More white verticillium-like anamorphs with erect conidiophores
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Rasoul Zare and Walter Gams
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0301 basic medicine ,Lecanicillium ,biology ,Hypocreaceae ,Hypomyces ,030108 mycology & parasitology ,biology.organism_classification ,Verticillium ,Agricultural and Biological Sciences (miscellaneous) ,03 medical and health sciences ,Type species ,030104 developmental biology ,Genus ,Botany ,Bionectriaceae ,Ribosomal DNA ,Ecology, Evolution, Behavior and Systematics - Abstract
This study focuses on the former Verticillium section Albo-erecta that included white or whitish species with verticillium-like, erect conidiophores. Its type species was Verticillium fungicola, which was transferred to Lecanicillium, a genus that otherwise contains species with prostrate conidiophores. Phylogenetic analysis of ITS, 18S and 28S rDNA sequences revealed that this group is heterogeneous and its members belong to at least three families. The present study is a first step to its resolution. Supported by analyses of 68 sequences of ITS, 23 sequences of 18S and 43 sequences of 28S ribosomal DNA, the species are distributed over three families. In the Cordycipitaceae, Leptobacillium gen. nov. is described with L. leptobactrum comb. nov. and its new variety, calidius. In the Hypocreaceae, Hypomyces is treated with one new combination from former Nectriopsis, H. tubariicola, and two new anamorphic species, H. ellipsosporus and H. subglobosus; in Sphaerostilbella, one new anamorphic species, S. parabroomeana, is described. In the Bionectriaceae, anamorphic isolates of Nectriopsis requiring a new combination, N. lindauiana, and a new species, N. fuliginicola, are described. Parsimony analysis of the LSU suggests that Ovicillium gen. nov. with four new species, O. attenuatum, O. oosporum, O. subglobosum and O. napiforme, is a member of the Bionectriaceae by 93 % bootstrap support. Of uncertain family classification are Chlamydocillium gen. nov. with one new soil-borne species, C. cyanophilum, and Chlorocillium gen. nov. based on Acremonium griseum Petch. A few further white verticillium-like anamorphs, particularly V. biguttatum, could not yet be reclassified.
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- 2016
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8. Accepted Trichoderma names in the year 2015
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John Bissett, Walter M. Jaklitsch, Gary J. Samuels, and Walter Gams
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Lists of Protected Names ,Nomenclature Committee ,Nomenclature ,Hypocrea ,Trichoderma virens ,Pleomorphic fungi ,Hypocrea patella ,Biology ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Article ,Trichoderma ,Botany ,Hypocreales ,Humanities ,Ecology, Evolution, Behavior and Systematics - Abstract
A list of 254 names of species and two names of varieties in Trichoderma with name or names against which they are to be protected, following the ICN (Melbourne Code, Art. 14.13), is presented for consideration by the General Committee established by the Congress, which then will refer them to the Nomenclature Committee for Fungi (NCF). This list includes 252 species, one variety and one form. Two new names are proposed: T. neocrassum Samuel (syn. Hypocrea crassa P. Chaverri & Samuels), T. patellotropicum Samuels (syn. Hypocrea patella f. tropica Yoshim. Doi). The following new combinations in Trichoderma are proposed: T. brevipes (Mont.) Samuels, T. cerebriforme (Berk.) Samuels, T. latizonatum (Peck) Samuels, and T. poronioideum (A. Moller) Samuels. The following species are lectotypified: T. americanum (Canham) Jaklitsch & Voglmayr, Gliocladium flavofuscum J.H. Miller, Giddens & A.A. Foster, T. inhamatum Veerkamp & W. Gams, T. konilangbra Samuels, O. Petrini & C.P. Kubicek, T. koningii Oudem., T. pezizoides (Berk. & Broome) Jaklitsch & Voglmayr, T. sulphureum (Schwein.) Jaklitsch & Voglmayr and T. virens (J.H. Miller, Giddens & A.A. Foster) Arx. Epitypes are proposed for the following species: T. albocorneum (Yoshim. Doi) Jaklitsch & Voglmayr, T. albofulvum (Berk. & Broome) Jaklitsch & Voglmayr, T. atrogelatinosum (Dingley) Jaklitsch & Voglmayr, T. corneum (Pat.) Jaklitsch & Voglmayr, T. cornu-damae (Pat.) Z.X. Zhu & W.Y. Zhuang, T. flaviconidium (P. Chaverri, Druzhinina & Samuels) Jaklitsch & Voglmayr, T. hamatum (Bonord.) Bain., T. hunua (Dingley) Jaklitsch & Voglmayr, T. patella (Cooke & Peck) Jaklitsch & Voglmayr, Hypocrea patella f. tropica Yoshim. Doi, T. polysporum (Link) Rifai, T. poronioideum (A. Moller) Samuels T. semiorbis (Berk.) Jaklitsch & Voglmayr, T. sulphureum (Schwein.) Jaklitsch & Voglmayr, and T. tropicosinense (P.G. Liu) P.G. Liu, Z.X. Zhu & W.Y. Zhuang.
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- 2015
9. Correspondence
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Ronald H. Petersen, Henning Knudsen, Svengunnar Ryman, and Walter Gams
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Agricultural and Biological Sciences (miscellaneous) ,Ecology, Evolution, Behavior and Systematics - Published
- 2016
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10. Generic names in the Orbiliaceae (Orbiliomycetes) and recommendations on which names should be protected or suppressed
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Marc Stadler, Ludmila Marvanová, Bin Liu, Evi Weber, Hans-Otto Baral, Xingzhong Liu, Michael Weiß, Guy Marson, Gregor Hagedorn, Walter Gams, and Helmholtz Centre for infection research, Inhoffenstr.7, 38124 Braunschweig, Germany.
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0301 basic medicine ,Phylogenetic tree ,biology ,Ecology ,Orbiliaceae ,030108 mycology & parasitology ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Arthrobotrys ,Trace (semiology) ,03 medical and health sciences ,Orbilia ,Evolutionary biology ,Genus ,Orbiliomycetes ,Nomenclature ,Ecology, Evolution, Behavior and Systematics - Abstract
A list of all generic names that have been connected with the Orbiliomycetes is provided. Recommendations are made as to which names should be used in accordance with the rules and the different generic concepts. There is a mismatch in the current generic concepts within Orbiliomycetes regarding the two morphs: a narrow concept is used for the asexual morphs, but a broad concept relies on the sexual morphs. As a consequence, many more generic names have been established for the asexual morphs. A number of previous generic concepts are artificial, since they were based on single characters without molecular support. In order to provide solutions for this mismatch, we present three different generic concepts within the Orbiliomycetes. A broad concept recognizes a large genus Orbilia, with which most of the listed names fall into synonymy, but could be maintained as infrageneric names. Due to the lack of data proving phylogenetic relationships, this broad concept, at present, is the most practicable and recommended one. A moderate concept subdivides Orbilia into several genera, with all nematode-trapping fungi merged in Arthrobotrys. A narrow generic concept accepts genera based on differences in trapping organs, but also subdivides the remaining groups of Orbilia into additional genera. Trapping of invertebrates (zoophagy) is not restricted to Arthrobotrys in a broad sense, but occurs also in the more distant basal genera Hyalorbilia and Lecophagus, which mainly prey on rhizopods and rotifers. Whether these predatory capabilities trace back to a common ancestor is not clear. The following new combinations are proposed: Hyalorbilia oviparasitica, Hyalorbilia quadridens, Hyalorbilia tenuifusaria, and Orbilia fissilis.
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- 2017
11. A revision of Sphaeria pilosa Pers. and re-evaluation of the Trichosphaeriales
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Walter Gams and Martina Réblová
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0301 basic medicine ,Trichosphaeriales ,biology ,Pilosa ,Zoology ,Sordariomycetes ,030108 mycology & parasitology ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Incertae sedis ,Chaetosphaeria ,03 medical and health sciences ,030104 developmental biology ,Genus ,Paraphyses ,Botany ,Basionym ,Ecology, Evolution, Behavior and Systematics - Abstract
Sphaeria pilosa, the basionym of the type of Trichosphaeria, T. pilosa, was insufficiently described by Persoon. The current interpretation of T. pilosa comes from Fuckel and is based on his own material published in the exsiccatal series Fungi Rhen. Exs. no. 946. The examination of the type and other authentic material of S. pilosa and T. pilosa revealed several different fungi. Fresh material of T. pilosa is not available and Fuckel’s historical specimens have never been sampled for DNA. In order to reconcile Persoon’s concept of S. pilosa with Fuckel’s concept of T. pilosa, we designate a neotype in our study. The species is a unitunicate ascomycete characterized by perithecial ascomata, persistent paraphyses, and cylindrical short-stipitate asci without visible apical annulus containing eight hyaline, ellipsoidal ascospores. The genus Trichosphaeria includes 87 described species and the Trichosphaeriales with the single family Trichosphaeriaceae recently accommodate 17 genera of apparently diverse phylogenetic affinity. Although the relationship of Trichosphaeria with other members of the Sordariomycetes is unknown, the family and order based on it are widely used to label incertae sedis clades inferred in phylogenetic analyses. Based on these findings, the Trichosphaeriales are re-evaluated and their use in phylogenetic studies is recommended to be abandoned until recognition of T. pilosa by molecular data.
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- 2016
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12. Minimizing the chaos following the loss of Article 59: Suggestions for a discussion
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Richard A. Humber, Roland Kirschner, Marc Stadler, Walter M. Jaklitsch, and Walter Gams
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Prioritization ,Paraphyly ,media_common.quotation_subject ,Zoology ,Plant Science ,Biology ,Genealogy ,Type species ,Taxon ,Genus ,Correct name ,Epithet ,Nomenclature ,Ecology, Evolution, Behavior and Systematics ,media_common - Abstract
We assert that the suppression at the 2011 Melbourne Botanical Congress of the dual nomenclature for pleomorphic fungi was premature since most fungal genera still remain inadequately typified and need molecularly based revisions. The new system turns a rule-determined nomenclature into a system of names to be decided by committees. The new system cannot be implemented until experts publish well-documented rationales about the generic names to be accepted or suppressed among alternative morphs and the responsible committees act officially. Prioritization vs. suppression is not the same as conservation vs. rejection. If a teleomorphic generic name is suppressed, it still remains valid and legitimate and can still serve as a basis for names of higher-rank taxa. In most cases the teleomorph genus name should be prioritized unless convincing arguments favor preference of the anamorph name. Paraphyletic genera must be recognized. Unless the phylogenetic positions of all type species for possible morphs are confirmed, no prioritization can be fixed. When a binomial in a prioritized genus has a younger epithet than the corresponding name in the suppressed genus, only priority of extant names in the prioritized genus should count.
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- 2012
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13. The genera of Hyphomycetes – 2011 update
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Walter Gams and Keith A. Seifert
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new species ,Clavicipitaceae ,Hypocreales ,Zoology ,Eurotiales ,Dothideomycetes ,Biology ,Hyphomycetes ,biology.organism_classification ,anamorphic fungi ,new genera ,Botany ,Pyronemataceae ,Pleosporales ,DNA barcoding ,moulds ,Cosmospora ,Ecology, Evolution, Behavior and Systematics ,Research Article - Abstract
This supplement to the taxonomic monograph The Genera of Hyphomycetes summarises information on 23 accepted new genera and c. 160 species described in 2011. These include three dematiaceous genera (Funbolia, Noosia, Pyrigemmula, all related to Dothideomycetes), a bulbil-producing genus, Spiroplana (Pleosporales), and two endophytic genera, the sterile Periglandula (Clavicipitaceae), and the hyaline, sympodial Micronematobotrys (Pyronemataceae). Slow-growing, morphologically-reduced, darkly pigmented fungi continue to be the source of new taxa, including the new genus Atramixtia (Dothioraceae). Eight new genera of darkly pigmented chlamydospore-like anamorphs were described from marine or subtidal environments (Glomerulispora, Halozoön, Hiogispora, Matsusporium, Moheitospora, Moleospora, Moromyces), mostly associated with subclades of the Lulworthiales. Several genera that are morphologically similar to but phylogenetically distinct from genera of the Capnodiales (Pseudopassalora, Scleroramularia) were introduced, as well as segregates from the classical concepts of Alternaria (Sinomyces), Chalara and Phialophora (Brachyalara, Infundichalara, Lasiadelphia), and Paecilomyces (Purpureocillium for the former Paecilomyces lilacinus complex). In addition, in anticipation of the new nomenclatural rules, newly configured formerly-teleomorph genera were proposed as segregates from classical hyphomycete genera in the Hypocreales, namely Acremonium (Cosmospora), Fusarium (Cyanonectria, Dialonectria, Geejayessia, Macroconia, Stylonectria), and Volutella (Pseudonectria) and the Trichocomaceae, Eurotiales, Penicillium (Talaromyces for the former Penicillium subg. Biverticillium). Standardized generic mini-diagnoses are provided for the accepted new genera, along with details of distribution, substrates, numbers of new species and phylogenetic affinities within the Dikarya. GenBank accession numbers for ITS DNA-barcodes are provided where available. New information on generic concepts of previously recognised genera, phylogenetic relationships, and corrections of factual errors are also included. Only two newly described genera, Fecundostilbum and Utrechtiana, seem to be synonyms of previously described genera.
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- 2011
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14. Fungal nomenclature 3. A critical response to the 'Amsterdam Declaration'
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Walter Gams and Walter M. Jaklitsch
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MycoBank ,Taxonomy (general) ,Declaration ,Identification (biology) ,Environmental ethics ,Plant Science ,Biology ,Nomenclature ,Ecology, Evolution, Behavior and Systematics ,Genealogy - Abstract
Numerous taxonomists and monographers of fungi are objecting an enforced unitary nomenclature for ascomycetes and basidiomycetes. Proposals 297 and subsequent ones by Redhead et al. (2010) and the "Amsterdam Declaration" (AD) demand more or less drastic and not necessarily efficient changes into this direction. Three groups of arguments in the AD are refuted: 1. The identification of organisms exclusively based on gene sequences is prone to errors and only a minority of the named fungi has been thoroughly studied so far with molecular methods. 2. There is no need for a mycological Code separate from the botanical one. Where taxonomy demands, special rules for Fungi have already been defined. The registration of taxonomic novelties required for valid publication is supported, but without MycoBank being entitled to make taxonomic statements. 3. Deletion of Article 59 is not possible without chaotic consequences. The mechanism of teleotypification alone does not lead to phylogenetically supported genera. Even after introducing a 'one fungus - one name' rule, mycologists will need to understand the so far prevailing system of dual nomenclature when screening the taxonomic literature.
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- 2011
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15. Monilochaetes and allied genera of the Glomerellales, and a reconsideration of families in the Microascales
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Martina Réblová, Walter Gams, and Keith A. Seifert
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biology ,Microascales ,Thielaviopsis ,Plant Science ,Articles ,Dothideomycetes ,Dischloridium ,Australiasca ,Australiascaceae ,phylogeny ,biology.organism_classification ,Ceratocystis ,Agricultural and Biological Sciences (miscellaneous) ,Chaetosphaeria ,Cylindrotrichum ,Plectosphaerellaceae ,Gondwanamycetaceae ,Type species ,Reticulascus ,Genus ,Reticulascaceae ,Botany ,Pleosporales ,Ceratocystidaceae - Abstract
We examined the phylogenetic relationships of two species that mimic Chaetosphaeria in teleomorph and anamorph morphologies, Chaetosphaeria tulasneorum with a Cylindrotrichum anamorph and Australiasca queenslandica with a Dischloridium anamorph. Four data sets were analysed: a) the internal transcribed spacer region including ITS1, 5.8S rDNA and ITS2 (ITS), b) nc28S (ncLSU) rDNA, c) nc18S (ncSSU) rDNA, and d) a combined data set of ncLSU-ncSSU-RPB2 (ribosomal polymerase B2). The traditional placement of Ch. tulasneorum in the Microascales based on ncLSU sequences is unsupported and Australiasca does not belong to the Chaetosphaeriaceae. Both holomorph species are nested within the Glomerellales. A new genus, Reticulascus, is introduced for Ch. tulasneorum with associated Cylindrotrichum anamorph; another species of Reticulascus and its anamorph in Cylindrotrichum are described as new. The taxonomic structure of the Glomerellales is clarified and the name is validly published. As delimited here, it includes three families, the Glomerellaceae and the newly described Australiascaceae and Reticulascaceae. Based on ITS and ncLSU rDNA sequence analyses, we confirm the synonymy of the anamorph genera Dischloridium with Monilochaetes. Consequently Dischloridium laeënse, type species of the genus, and three related species are transferred to the older genus Monilochaetes. The teleomorph of D. laeënse is described in Australiasca as a new species. The Plectosphaerellaceae, to which the anamorph genus Stachylidium is added, is basal to the Glomerellales in the three-gene phylogeny. Stilbella annulata also belongs to this family and is newly combined in Acrostalagmus. Phylogenetic analyses based on ncLSU, ncSSU, and combined ncLSU-ncSSU-RPB2 sequences clarify family relationships within the Microascales. The family Ceratocystidaceae is validated as a strongly supported monophyletic group consisting of Ceratocystis, Cornuvesica, Thielaviopsis, and the type species of Ambrosiella. The new family Gondwanamycetaceae, a strongly supported sister clade to the Ceratocystidaceae, is introduced for the teleomorph genus Gondwanamyces and its Custingophora anamorphs. Four families are accepted in the Microascales, namely the Ceratocystidaceae, Gondwanamycetaceae, Halosphaeriaceae, and Microascaceae. Because of a suggested affinity of a Faurelina indica isolate to the Microascales, the phylogenetic position of the Chadefaudiellaceae is reevaluated. Based on the results from a separate ncLSU analysis of the Dothideomycetes, Faurelina is excluded from the Microascales and placed in the Pleosporales.
- Published
- 2011
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16. Teleotypification of fungal names and its limitations
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Walter M. Jaklitsch, Martina Réblová, Roland Kirschner, and Walter Gams
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Monophyly ,business.industry ,Genus ,Botany ,Plant Science ,Artificial intelligence ,Biology ,computer.software_genre ,business ,computer ,Ecology, Evolution, Behavior and Systematics ,Natural language processing - Abstract
Article 59.7 of the ICBN (Vienna Code) allows the epitypification of a name of a fungus, known until then only as an anamorph, with teleomorphic material in order to avoid introducing an additional name. Redhead suggested calling this procedure teleotypification. We demonstrate that it is not desirable to apply teleotypification to newly discovered teleomorphs offungi for which a suitable teleomorph genus is available. Describing a newly found anamorphic fungus under a teleomorph-typified generic name may be defended, provided generic homogeneity is proven with molecular methods and no suitable anamorph genus is available. Alternative proposals will be submitted to either return to the previous situation without teleotypification or to restrict teleotypification explicitly to cases where the original genus is monotypic or at least clearly monophyletic, and no suitable teleomorph genus is available.
- Published
- 2010
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17. New and validated hyphomycete taxa to resolve nomenclatural and taxonomic issues
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Keith A. Seifert, Morgan-Jones G, and Walter Gams
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Taxon ,Ecology ,Taxonomy (biology) ,Plant Science ,Taxonomic rank ,Biology ,Nomenclature ,Ecology, Evolution, Behavior and Systematics - Published
- 2009
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18. Aib and Iva in the Biosphere: Neither Rare nor Necessarily Extraterrestrial
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Thomas Degenkolb, Hans Brückner, Walter Gams, and Dieter Becker
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Aminoisobutyric Acids ,Microfungi ,Extraterrestrial Environment ,Bioengineering ,Biochemistry ,Gas Chromatography-Mass Spectrometry ,chemistry.chemical_compound ,Hypocrea ,Psychrophile ,Molecular Biology ,Peptaibols ,Geography ,biology ,Acremonium ,Fungi ,Tolypocladium ,Bionectria ,Valine ,General Chemistry ,General Medicine ,biology.organism_classification ,chemistry ,Isovaline ,Molecular Medicine ,Nutrient agar - Abstract
Fourty-nine species and strains of filamentous fungi of the genera Acremonium, Bionectria, Clonostachys, Emericellopsis, Hypocrea/Trichoderma, Lecythophora, Monocillium, Nectriopsis, Niesslia, Tolypocladium, and Wardomyces, deposited with the culture collection of the Centraalbureau voor Schimmelcultures (CBS) in Utrecht, The Netherlands, were grown on nutrient agar plates. Organic extracts of mycelia were analyzed after acidic total hydrolysis and derivatization by GC/SIM-MS on Chirasil-L-Val for the presence of Aib (=alpha-aminoisobutyric acid, 2-methylalanine) and DL-Iva (=isovaline, 2-ethylalanine). In 37 of the hydrolysates, Aib was detected, and in several of them D-Iva or mixtures of D- and L-Iva. Non-proteinogenic Aib, in particular, is a highly specific marker for a distinctive group of fungal polypeptides named peptaibols or, comprehensively, peptaibiotics, i.e., peptides containing Aib and displaying (anti)biotic activities. The biotic synthesis of these amino acids by filamentous fungi contradicts the still widespread belief that alpha,alpha-dialkyl-alpha-amino acids do not or rarely occur in the biosphere and, if detected, are of extraterrestrial origin. The abundant production of peptaibiotics by cosmopolitan species of microfungi has also to be considered in the discussion on the occurrence of Aib and Iva in ancient and recent sediments. The detection of trace amounts of Aib in ice samples of Antarctica that are devoid of meteorites might also be related to the presence of Aib-producing microorganisms, being either indigenous psychrophiles, or being transported and localized by mechanisms related to bioaerosols and cryoconites. The presence of microfungi being capable of producing alpha,alpha-dialkyl alpha-amino acids in terrestrial samples, and possible contamination of extraterrestrial materials are pointed out to be of relevance for the reliable interpretation of cosmogeochemical data.
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- 2009
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19. Natural Cyclopeptaibiotics and Related Cyclic Tetrapeptides: Structural Diversity and Future Prospects
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Thomas Degenkolb, Walter Gams, and Hans Brückner
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Chemistry ,Stereochemistry ,Structural diversity ,Bioengineering ,General Chemistry ,General Medicine ,Diheteropeptin ,Computational biology ,Peptides, Cyclic ,Biochemistry ,Structure-Activity Relationship ,Chlamydocin ,Animals ,Humans ,Molecular Medicine ,Molecular Biology - Abstract
Linearity is not considered a prerequisite anymore, and extension of the current definition of 'peptaibiotics' to cyclic, Aib-containing peptides is proposed. Sequences and bioactivities, together with ecophysiological importance of cyclopeptaibiotics and related cyclic tetrapeptides, and their fungal-taxonomic relationships, are discussed.
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- 2008
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20. Plectosporium delsorboi n. sp., a pathogen of Curcuma, Zingiberaceae
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Walter Gams, Vincenzo Antignani, and Fabrizio Marziano
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biology ,Plectosporium ,Botany ,Zingiberaceae ,Taxonomy (biology) ,Plant Science ,Fungal morphology ,Curcuma ,biology.organism_classification ,Pathogen ,Ecology, Evolution, Behavior and Systematics ,Conidium ,Microbiology - Published
- 2008
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21. Recent Changes in Fungal Nomenclature and Their Impact on Naming of Microfungi
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Walter Gams
- Subjects
Modes of reproduction ,Microfungi ,Ecology ,Principle of Priority ,Identification (biology) ,Biology ,Nomenclature ,Genealogy - Abstract
Until August 2011 an unusual situation had prevailed in fungal nomenclature for many decades: different forms of sporulation of a fungus were allowed to have different names in different genera, depending on whether a sexual (teleomorphic) or asexual (anamorphic) reproduction was involved (the so-called dual nomenclature). Because of great morphological differences between these morphs, their modes of reproduction often being independent from each other, and incongruent delimitation of correlated genera, this system had great advantages for the morphological identification of a fungus, but it was incompatible with the presently much more reliable possibilities of identification with molecular methods. A change toward unification was predicted to have drastic repercussions, destabilizing nomenclature in an uncontrollable way. After heavy debates among mycologists, the mainly botanical community of the nomenclature sessions at the International Botanical Congress in Melbourne nevertheless voted for such a change. Since 30 July 2011, dual nomenclature is no longer permitted and a choice must be made among the available names, no matter whether anamorphic or teleomorphic, according to the nomenclatural principle of priority. To provide for some stability, provisions are introduced for the preparation of lists of protected/suppressed names, in which deviation from temporal priority is possible when leading to meaningful generic circumscription and following established usage; names on these lists will subsequently be regarded as conserved/suppressed. The work on these lists for some groups of fungi has been very intense in recent months, and preliminary results were presented at the International Mycological Congress (IMC10) in Bangkok in August 2014.
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- 2016
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22. Pochonia globispora sp. nov
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Rasoul Zare and Walter Gams
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biology ,Botany ,Pochonia ,Taxonomy (biology) ,Plant Science ,Fungal morphology ,Pochonia globispora ,biology.organism_classification ,Ecology, Evolution, Behavior and Systematics - Abstract
Pochonia globispora 08 ) " " Abstract >) 08109 Pochonia P globispora 0 01 + 012 1 B + 0/ 2) /+0 1 )82/11) 8 1 )2 0 P globispora 0 1/00 P chlamydosporia ) 2+009 = 0C )10) 09 ( 2 Pochonia 0810 + 8 #D0C )1 )1 .=200 2)/ 081009 E) ) 2 ) / /1E08/ 1// / 1 12/( 08 0 Key words Pochonia )( 82 09 )
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- 2007
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23. Coniochaeta ershadii, a new species from Iran, and a key to well-documented Coniochaeta species
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Rasoul Zare, Bita Asgari, and Walter Gams
- Subjects
Peridium ,Coniochaeta ,Botany ,Key (lock) ,Seta ,Taxonomy (biology) ,Plant Science ,Fungal morphology ,Biology ,biology.organism_classification ,Ecology, Evolution, Behavior and Systematics ,Conidium - Abstract
A new species of Coniochaeta from dead pistachio twigs, C. ershadii, is described from Varamin district, Tehran Province. C. ershadii differs from the similar C. gamsii by possessing smaller ascocarps covered with setae, a peridium with an irregular texture, longer and narrower asci, shorter ascospores, and by producing numerous crystals when cultivated on Leonian agar and other media. It is particularly distinguished by its ascospores with protruding ends up to 1.7-2.5 μm long. The conidiophores of the nodulisporium-like anamorph of C. ershadii produce 2-3 conidiogenous loci and cylindrical blastoconidia with attenuated bases. A dichotomous key for identification of 54 sufficiently documented Coniochaeta species is provided.
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- 2007
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24. Phylogenetic and morphotaxonomic revision of Ramichloridium and allied genera
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Johannes Z. Groenewald, Mahdi Arzanlou, Hyeon Dong Shin, Uwe Braun, Pedro W. Crous, and Walter Gams
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Herpotrichiellaceae ,Zoology ,Plant Science ,phylogeny ,ribosomal dna ,030308 mycology & parasitology ,03 medical and health sciences ,taxonomy ,Genus ,Botany ,Pleosporales ,030304 developmental biology ,Chaetothyriales ,0303 health sciences ,biology ,Mycosphaerella ,EPS-4 ,anamorphs ,Sordariomycetes ,Articles ,15. Life on land ,biology.organism_classification ,Capnodiales ,Agricultural and Biological Sciences (miscellaneous) ,Incertae sedis ,veronaea ,phialophora ,Laboratorium voor Phytopathologie ,Type species ,Rhinocladiella ,Veronaea ,Periconiella ,pheohyphomycosis ,herpotrichiellaceae ,Laboratory of Phytopathology ,identification ,fungi ,sp-nov - Abstract
The phylogeny of the genera Periconiella, Ramichloridium, Rhinocladiella and Veronaea was explored by means of partial sequences of the 28S (LSU) rRNA gene and the ITS region (ITS1, 5.8S rDNA and ITS2). Based on the LSU sequence data, ramichloridium-like species segregate into eight distinct clusters. These include the Capnodiales (Mycosphaerellaceae and Teratosphaeriaceae), the Chaetothyriales (Herpotrichiellaceae), the Pleosporales, and five ascomycete clades with uncertain affinities. The type species of Ramichloridium, R. apiculatum, together with R. musae, R. biverticillatum, R. cerophilum, R. verrucosum, R. pini, and three new species isolated from Strelitzia, Musa and forest soil, respectively, reside in the Capnodiales clade. The human-pathogenic species R. mackenziei and R. basitonum, together with R. fasciculatum and R. anceps, cluster with Rhinocladiella (type species: Rh. atrovirens, Herpotrichiellaceae, Chaetothyriales), and are allocated to this genus. Veronaea botryosa, the type species of the genus Veronaea, also resides in the Chaetothyriales clade, whereas Veronaea simplex clusters as a sister taxon to the Venturiaceae (Pleosporales), and is placed in a new genus, Veronaeopsis. Ramichloridium obovoideum clusters with Carpoligna pleurothecii (anamorph: Pleurothecium sp., Chaetosphaeriales), and a new combination is proposed in Pleurothecium. Other ramichloridium-like clades include R. subulatum and R. epichloës (incertae sedis, Sordariomycetes), for which a new genus, Radulidium is erected. Ramichloridium schulzeri and its varieties are placed in a new genus, Myrmecridium (incertae sedis, Sordariomycetes). The genus Pseudovirgaria (incertae sedis) is introduced to accommodate ramichloridium-like isolates occurring on various species of rust fungi. A veronaea-like isolate from Bertia moriformis with phylogenetic affinity to the Annulatascaceae (Sordariomycetidae) is placed in a new genus, Rhodoveronaea. Besides Ramichloridium, Periconiella is also polyphyletic. Thysanorea is introduced to accommodate Periconiella papuana (Herpotrichiellaceae), which is unrelated to the type species, P. velutina (Mycosphaerellaceae).Taxonomic novelties: Myrmecridium Arzanlou, W. Gams & Crous, gen. nov., Myrmecridium flexuosum (de Hoog) Arzanlou, W. Gams& Crous, comb. et stat. nov., Myrmecridium schulzeri (Sacc.) Arzanlou, W. Gams & Crous var. schulzeri, comb. nov., Myrmecridium schulzeri var. tritici (M.B. Ellis) Arzanlou, W. Gams & Crous, comb. nov., Periconiella arcuata Arzanlou, S. Lee & Crous, sp. nov., Periconiella levispora Arzanlou, W. Gams& Crous, sp. nov., Pleurothecium obovoideum (Matsush.) Arzanlou& Crous, comb. nov., Pseudovirgaria H.D. Shin, U. Braun, Arzanlou& Crous, gen. nov., Pseudovirgaria hyperparasitica H.D. Shin, U. Braun, Arzanlou & Crous, sp. nov., Radulidium Arzanlou, W. Gams& Crous, gen. nov., Radulidium epichloës (Ellis & Dearn.) Arzanlou, W. Gams & Crous, comb. nov., Radulidium subulatum (de Hoog) Arzanlou, W. Gams & Crous, comb. nov., Ramichloridium australiense Arzanlou & Crous, sp. nov., Ramichloridium biverticillatum Arzanlou & Crous, nom. nov., Ramichloridium brasilianum Arzanlou & Crous, sp. nov., Ramichloridium strelitziae Arzanlou, W. Gams & Crous, sp. nov., Rhinocladiella basitona (de Hoog) Arzanlou & Crous, comb. nov., Rhinocladiella fasciculata (V. Rao & de Hoog) Arzanlou & Crous, comb. nov., Rhinocladiella mackenziei (C.K. Campb. & Al-Hedaithy) Arzanlou & Crous, comb. nov., Rhodoveronaea Arzanlou, W. Gams & Crous, gen. nov., Rhodoveronaea varioseptata Arzanlou, W. Gams & Crous, sp. nov., Thysanorea Arzanlou, W. Gams& Crous, gen. nov., Thysanorea papuana (Aptroot) Arzanlou, W. Gams & Crous, comb. nov., Veronaea japonica Arzanlou, W. Gams& Crous, sp. nov., Veronaeopsis Arzanlou & Crous, gen. nov., Veronaeopsis simplex (Papendorf) Arzanlou & Crous, comb.nov.
- Published
- 2007
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25. International Society of Human and Animal Mycology (ISHAM)-ITS reference DNA barcoding database - the quality controlled standard tool for routine identification of human and animal pathogenic fungi
- Author
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Wieland Meyer, Laurence Delhaes, Nausicaa Gantois, Michael Arabatzis, Duong Vu, Mauro de Medeiros Muniz, Françoise Dromer, Maria Lucia Taylor, Josep Guarro, Alejandra Giraldo, Rosely Maria Zancopé-Oliveira, Walter Gams, Dea Garcia-Hermoso, Marcelo R. S. Briones, Analy Salles de Azevedo Melo, Aristea Velegraki, Stéphane Ranque, Sharon C.-A. Chen, Conchita Toriello, Carole Cassagne, Célia Pais, Célia Maria de Almeida Soares, Arnaldo Lopes Colombo, Marie Desnos-Ollivier, Fanrong Kong, Laszlo Irinyi, Annie Ying Sun, Catriona Halliday, Shu Yao Duan, David Ellis, Juliana Alves Parente Rocha, Laura Rosio Castañón-Olivares, José F. Cano-Lira, Carolina Serena, Marcelo Sandoval-Denis, Paula Sampaio, Sybren de Hoog, Gianluigi Cardinali, Françoise Botterel, Ian Arthur, Renaud Piarroux, Anne-Cécile Normand, Zuotao Zhao, Vincent Robert, Aziza Khan, Renata C. Ferreira, Conrad L. Schoch, Xianyu Zeng, Charles Mary, Karina Bellinghausen Merseguel, Barbara Robbertse, Daniel Estrada-Bárcenas, Dirk Stubbe, Keith Cássia da Cunha, Angela Satie Nishikaku, Marijke Hendrickx, Tania C. Sorrell, [et al.], and Universidade do Minho
- Subjects
interspecies genetic diversity ,Library science ,Biology ,03 medical and health sciences ,fungal identification ,DNA, Ribosomal Spacer ,fungal identification, DNA barcoding, ITS region, reference ITS database, intraspecies/interspecies genetic diversity ,Animals ,DNA Barcoding, Taxonomic ,Humans ,DNA barcoding ,Fungal identification ,reference ITS database ,Reference standards ,030304 developmental biology ,Genetics ,National health ,0303 health sciences ,Science & Technology ,030306 microbiology ,Its region ,National library ,Reference ITS database ,Medical school ,Fungi ,ITS region ,General Medicine ,Reference Standards ,3. Good health ,Pathogenic organism ,intraspecies/interspecies genetic diversity ,Infectious Diseases ,Molecular Diagnostic Techniques ,Mycoses ,intraspecies ,Databases, Nucleic Acid ,Intraspecies/interspecies genetic diversity - Abstract
Human and animal fungal pathogens are a growing threat worldwide leading to emerging infections and creating new risks for established ones. There is a growing need for a rapid and accurate identification of pathogens to enable early diagnosis and targeted antifungal therapy. Morphological and biochemical identification methods are time-consuming and require trained experts. Alternatively, molecular methods, such as DNA barcoding, a powerful and easy tool for rapid monophasic identification, offer a practical approach for species identification and less demanding in terms of taxonomical expertise. However, its wide-spread use is still limited by a lack of quality-controlled reference databases and the evolving recognition and definition of new fungal species/complexes. An international consortium of medical mycology laboratories was formed aiming to establish a quality controlled ITS database under the umbrella of the ISHAM working group on "DNA barcoding of human and animal pathogenic fungi." A new database, containing 2800 ITS sequences representing 421 fungal species, providing the medical community with a freely accessible tool at http://www.isham.org and http://its.mycologylab.org/ to rapidly and reliably identify most agents of mycoses, was established. The generated sequences included in the new database were used to evaluate the variation and overall utility of the ITS region for the identification of pathogenic fungi at intra-and interspecies level. The average intraspecies variation ranged from 0 to 2.25%. This highlighted selected pathogenic fungal species, such as the dermatophytes and emerging yeast, for which additional molecular methods/genetic markers are required for their reliable identification from clinical and veterinary specimens., This study was supported by an National Health and Medical Research Council of Australia (NH&MRC) grant [#APP1031952] to W Meyer, S Chen, V Robert, and D Ellis; CNPq [350338/2000-0] and FAPERJ [E-26/103.157/2011] grants to RM Zancope-Oliveira; CNPq [308011/2010-4] and FAPESP [2007/08575-1] Fundacao de Amparo Pesquisa do Estado de So Paulo (FAPESP) grants to AL Colombo; PEst-OE/BIA/UI4050/2014 from Fundacao para a Ciencia e Tecnologia (FCT) to C Pais; the Belgian Science Policy Office (Belspo) to BCCM/IHEM; the MEXBOL program of CONACyT-Mexico, [ref. number: 1228961 to ML Taylor and [122481] to C Toriello; the Institut Pasteur and Institut de Veil le Sanitaire to F Dromer and D Garcia-Hermoso; and the grants from the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) and the Fundacao de Amparo a Pesquisa do Estado de Goias (FAPEG) to CM de Almeida Soares and JA Parente Rocha. I Arthur would like to thank G Cherian, A Higgins and the staff of the Molecular Diagnostics Laboratory, Division of Microbiology and Infectious Diseases, Path West, QEII Medial Centre. Dromer would like to thank for the technical help of the sequencing facility and specifically that of I, Diancourt, A-S Delannoy-Vieillard, J-M Thiberge (Genotyping of Pathogens and Public Health, Institut Pasteur). RM Zancope-Oliveira would like to thank the Genomic/DNA Sequencing Platform at Fundacao Oswaldo Cruz-PDTIS/FIOCRUZ [RPT01A], Brazil for the sequencing. B Robbertse and CL Schoch acknowledge support from the Intramural Research Program of the NIH, National Library of Medicine. T Sorrell's work is funded by the NH&MRC of Australia; she is a Sydney Medical School Foundation Fellow., info:eu-repo/semantics/publishedVersion
- Published
- 2015
26. Biodiversity of soil-inhabiting fungi
- Author
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Walter Gams
- Subjects
Fusarium ,Species complex ,Ecology ,biology ,Biodiversity ,biology.organism_classification ,complex mixtures ,Trichoderma ,Penicillium ,Botany ,Glomerales ,Ecology, Evolution, Behavior and Systematics ,Marine fungi ,Nature and Landscape Conservation ,Global biodiversity - Abstract
This survey is concerned only with filamentous fungi living in the soil layer. The observed diversity of soil fungi largely depends on the method used and the numbers of isolates obtained. Particle-plating usually yields higher numbers of taxa than dilution plating. The Centraalbureau voor Schimmelcultures (CBS) preserves a great diversity of soil fungi. The CBS database contained 2,210 species of soil fungi in 2001, an estimated 70% of the known species available in culture. Thus, the current estimate for described culturable soil fungi is approximately 3,150 species, many of which have a cosmopolitan distribution. Adding the ca. 150 spp. of nonculturable Glomerales results in 3,300 species of currently known soil fungi. Molecular studies in such groups as Fusarium, Trichoderma, Penicillium, and Aspergillus are finding a number of more narrowly distributed cryptic species. Thus the number of species of soil fungi is expected to be considerably higher than the 3300 species currently known.
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- 2006
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27. Taxonomy and Pathology of Togninia (Diaporthales) and its Phaeoacremonium Anamorphs
- Author
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Johannes Z. Groenewald, Lizel Mostert, Richard C. Summerbell, Pedro W. Crous, and Walter Gams
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Systematics ,LSU ,Phaeoacremonium ,Togninia ,SSU ,Plant Science ,Biology ,phylogeny ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Phaeoacremonium aleophilum ,Genus ,Calosphaeriales ,morphology ,Botany ,β-tubulin ,Taxonomy (biology) ,Heterothallic ,Togniniaceae ,BioloMICS ,systematics ,Calosphaeria ,Actin ,Diaporthales - Abstract
The genus Togninia (Diaporthales, Togniniaceae) is here monographed along with its Phaeoacremonium (Pm.) anamorphs. Ten species of Togninia and 22 species of Phaeoacremonium are treated. Several new species of Togninia (T.) are described, namely T. argentinensis (anamorph Pm. argentinense), T. austroafricana (anamorph Pm. austroafricanum), T. krajdenii, T. parasitica, T. rubrigena and T. viticola. New species of Phaeoacremonium include Pm. novae-zealandiae (teleomorph T. novae-zealandiae), Pm. iranianum, Pm. sphinctrophorum and Pm. theobromatis. Species can be identified based on their cultural and morphological characters, supported by DNA data derived from partial sequences of the actin and β-tubulin genes. Phylogenies of the SSU and LSU rRNA genes were used to determine whether Togninia has more affinity with the Calosphaeriales or the Diaporthales. The results confirmed that Togninia had a higher affinity to the Diaporthales than the Calosphaeriales. Examination of type specimens revealed that T. cornicola, T. vasculosa, T. rhododendri, T. minima var. timidula and T. villosa, were not members of Togninia. The new combinations Calosphaeria cornicola, Calosphaeria rhododendri, Calosphaeria transversa, Calosphaeria tumidula, Calosphaeria vasculosa and Jattaea villosa are proposed. Species of Phaeoacremonium are known vascular plant pathogens causing wilting and dieback of woody plants. The most prominent diseases in which they are involved are Petri disease and esca, which occur on grapevines and are caused by a complex of fungi, often including multiple species of Phaeoacremonium. Various Phaeoacremonium species are opportunistic fungi on humans and cause phaeohyphomycosis. The correct and rapid identification of Phaeoacremonium species is important to facilitate the understanding of their involvement in plant as well as human disease. A rapid identification method was developed for the 22 species of Phaeacremonium. It involved the use of 23 species-specific primers, including 20 primers targeting the β-tubulin gene and three targeting the actin gene. These primers can be used in 14 multiplex reactions. Additionally, a multiple-entry electronic key based on morphological, cultural and β-tubulin sequence data was developed to facilitate phenotypic and sequence-based species identification of the different Phaeoacremonium species. Separate dichotomous keys are provided for the identification of the Togninia and Phaeoacremonium species. Keys for the identification of Phaeoacremonium-like fungi and the genera related to Togninia are also provided. The mating strategy of several Togninia species was investigated with ascospores obtained from fertile perithecia produced in vitro. Togninia argentinensis and T. novae-zealandiae have homothallic mating systems, whereas T. austroafricana, T. krajdenii, T. minima, T. parasitica, T. rubrigena and T. viticola were heterothallic. Taxonomic novelties: Calosphaeria rhododendri (Rehm) L. Mostert comb. nov., C. transversa (Sacc. & Farim.) L. Mostert comb. nov., Jattaea villosa (Nitschke) L. Mostert comb. nov., Phaeoacremonium iranianum L. Mostert, Graf., W. Gams & Crous sp. nov., Pm. sphinctrophorum L. Mostert, Summerb. & Crous sp. nov., Pm. theobromatis L. Mostert, H.C. Evans, Summerb. & Crous sp. nov., Togninia argentinensis L. Mostert, W. Gams & Crous sp. nov. (anamorph Pm. argentinense L. Mostert, W. Gams & Crous sp. nov.), T. austroafricana L. Mostert, W. Gams & Crous sp nov. (anamorph Pm. austroafricanum L. Mostert, W. Gams & Crous sp. nov.), T. krajdenii L. Mostert, W. Gams & Crous sp. nov., Pm. novae-zealandiae L. Mostert, W. Gams & Crous sp. nov., T. parasitica L. Mostert, W. Gams & Crous sp. nov., T. rubrigena L. Mostert, W. Gams & Crous sp. nov., T. viticola L. Mostert, W. Gams & Crous sp. nov.
- Published
- 2006
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28. Hypocrea and Trichoderma studies marking the 90th birthday of Joan M. Dingley
- Author
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Gary J. Samuels, Walter Gams, and Barrie E. Overton
- Subjects
biology ,Hypocrea ,Trichoderma ,Botany ,Plant Science ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) - Published
- 2006
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29. A redescription of Plectosporium alismatis (hyphomycetes with glomerellaceous affinities)
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Wayne M. Pitt and Walter Gams
- Subjects
Appressorium ,Plectosphaerella ,biology ,Plectosporium alismatis ,Botany ,Phialide ,Plant Science ,Hyphomycetes ,biology.organism_classification ,Affinities ,Ecology, Evolution, Behavior and Systematics - Published
- 2005
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30. Lectotypification and status ofIsariaPers. : Fr
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Walter Gams, Robert A. Samson, Richard P. Korf, Keith A. Seifert, and Kathie T. Hodge
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Genus ,Botany ,Typification ,Zoology ,Isaria farinosa ,Plant Science ,Biology ,Nomenclature ,Ecology, Evolution, Behavior and Systematics - Abstract
The nomenclatural status and history of the generic name Isaria are reviewed. Authorship and typification are discussed, and we conclude that Isaria Pers. : Fr. is a validly published generic name that has previously beeneffectively and appropriately lectotypified by Isaria farinosa (Holm : Fr.) Fr. A lectotype illustration and an epitype specimen are designated for I. farinosa. We suggest that the name Isaria be used for species previously assigned to Paecilomyces section Isarioidea Samson. Further taxonomic studies are required to determine the appropriate circumscription of Isaria. Our conclusions preserve a Friesian genus in a familiar sense.
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- 2005
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31. Conspecificity of the cerulenin and helvolic acid producing ‘Cephalosporium caerulens’, and the hypocrealean fungus Sarocladium oryzae
- Author
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Walter Gams, Gonzalo Platas, and Gerald F. Bills
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Hypocreales ,Plant Science ,Fungus ,DNA, Ribosomal ,Microbiology ,chemistry.chemical_compound ,Sarocladium oryzae ,Ascomycota ,Genetics ,DNA, Fungal ,Ribosomal DNA ,Phylogeny ,Ecology, Evolution, Behavior and Systematics ,biology ,Fungal genetics ,food and beverages ,Ribosomal RNA ,biology.organism_classification ,Cerulenin ,Acremonium ,chemistry ,lipids (amino acids, peptides, and proteins) ,Fermentation ,Fusidic Acid ,Biotechnology - Abstract
Fermentation processes for the biochemical reagents cerulenin and helvolic acid employ 'Cephalosporium caerulens,' an invalidly published designation that has been used for more than 40 years. However, its identity has never been critically examined because strains were unavailable from major culture collections. An authentic strain of C. caerulens', derived from the original strain KF-140, was recently found and compared to Sarocladium oryzae, another Acremonium-like fungus which also produces cerulenin and helvolic acid. Morphological comparisons, rDNA sequence data, and chromatography of secondary metabolites established that 'C. caerulens' and S. oryzae are conspecific. Sequence data from ribosomal DNA genes indicated S. oryzae belongs to the Hypocreales and is allied with members of the Ceratostomataceae, Scopinella species, Emericellopsis species and certain Acremonium-like anamorphs of uncertain familial relationships. At least two of the isolates of S. oryzae produced titres of cerulenin and helvolic acid similar to those of KF-140. This finding demonstrates that manufacture of cerulenin need not be limited to the original strain.
- Published
- 2004
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32. Umbelopsis dimorpha sp. nov., a link between U. vinacea and U. versiformis
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Wieland Meyer, Walter Gams, Daniel Mahoney, and Mieke Starink-Willemse
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Base Sequence ,Sporangium ,Botany ,Genetics ,Mitosporic Fungi ,Plant Science ,Biology ,DNA, Fungal ,Phylogeny ,Ecology, Evolution, Behavior and Systematics ,Biotechnology ,Umbelopsis dimorpha - Abstract
The new species Umbelopsis dimorpha sp. nov. was isolated from a soil sample in the Red Hills area of Mt Richmond Forest Park, in the northern part of the South Island of New Zealand. It has two kinds of pale pinkish sporangia: (1) single-spored, indistinguishable from those of U. versiformis; and (2) multi-spored, similar to those of U. vinacea. ITS sequences place the species in the immediate vicinity of the former species.
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- 2004
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33. The occurrence of peptaibols and structurally related peptaibiotics in fungi and their mass spectrometric identification via diagnostic fragment ions
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Udo Gräfe, Walter Gams, Thomas Degenkolb, Brigitte Schlegel, and Albrecht Berg
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Pharmacology ,Chromatography ,Structural Biology ,Chemistry ,Stereochemistry ,Organic Chemistry ,Drug Discovery ,Molecular Medicine ,General Medicine ,Mass spectrometry ,Molecular Biology ,Biochemistry ,Mass spectrometric - Abstract
Peptaibols and related peptide antibiotics (peptaibiotics) display diagnostically useful fragmentation patterns during mass spectrometry (FAB-MS, ESI-CID-MS/MS and CID-MSn]. The paper compiles fragmentation data of pseudo-molecular ions reported in the literature as a guide to the rational identification of recurrently isolated and new peptaibols and peptaibiotics. Taxonomic and ecological aspects of microorganisms producing peptaibols and peptaibiotics are discussed.
- Published
- 2003
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34. Togninia (Calosphaeriales) is confirmed as teleomorph of Phaeoacremonium by means of morphology, sexual compatibility and DNA phylogeny
- Author
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Lizel Mostert, Pedro W. Crous, J. Z. (Ewald) Groenewald, Walter Gams, and Richard C. Summerbell
- Subjects
0106 biological sciences ,0301 basic medicine ,Physiology ,EPS-4 ,Cell Biology ,General Medicine ,030108 mycology & parasitology ,decline ,010603 evolutionary biology ,01 natural sciences ,diseases ,grapevine ,Laboratorium voor Phytopathologie ,03 medical and health sciences ,Laboratory of Phytopathology ,Genetics ,Molecular Biology ,Ecology, Evolution, Behavior and Systematics - Abstract
Petri disease, or black goo, is a serious disease of vines in most areas where grapevines are cultivated. The predominant associated fungus is Phaeomoniella chlamydospora (Chaetothyriales). Several species of Phaeoacremonium (Pm.) also are associated, of which Pm. aleophilum is the most common. Although no teleomorph is known for Phaeoacremonium, the genus Togninia previously has been linked to phaeoacremonium-like anamorphs. To investigate the possible anamorph-teleomorph connection of Phaeoacremonium to Togninia, anamorphs of Togninia minima, T. fraxinopennsylvanica and T. novae-zealandiae morphologically were compared with Pm. aleophilum and some representative cultures were mated in all combinations. Although no interspecies mating proved fertile, matings between isolates of Pm. aleophilum produced a Togninia teleomorph within 3-4 weeks. Certain field isolates of Pm. aleophilum commonly produced the teleomorph, demonstrating that both mating types can occur in the same vine and thus also explaining the genetic diversity observed for this fungus in some vineyards. To elucidate the phylogenetic relationships among these taxa, isolates were subjected to sequence analysis of the nuclear ribosomal internal transcribed spacers (ITS1, ITS2) and the 5.8S rRNA gene, as well as portions of the translation elongation factor 1 alpha (EF-1α) gene. The generic placement of teleomorphs within Togninia (Calosphaeriales) further was confirmed via phylogenetic analyses of 18S small subunit (SSU) DNA. From these sequences, morphological and mating data, we conclude that T. minima is the teleomorph of Pm. aleophilum, and that it has a biallelic heterothallic mating system. An epitype and mating type tester strains also are designated for T. minima.
- Published
- 2003
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35. Umbelopsis gibberispora sp. nov. from Japanese leaf litter and a clarification of Micromucor ramannianus var. angulisporus
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Seiji Tokumasu, Walter Gams, and Masato Sugiyama
- Subjects
Mucorales ,Phylogenetic tree ,biology ,Genus ,Sporangium ,Molecular phylogenetics ,Botany ,Umbelopsidaceae ,biology.organism_classification ,Clade ,Ribosomal DNA ,Ecology, Evolution, Behavior and Systematics - Abstract
Umbelopsis gibberispora is described as a new species in the genus Umbelopsis, Umbelopsidaceae, Mucorales. The species differs from others in this genus by ellipsoidal sporangiospores with unilaterally thickened walls. Phylogenetic analyses based on nuclear large subunit ribosomal DNA (nLSU rDNA) partial sequences suggest that U. gibberispora, U. swartii, and U. westeae form a clade together with the strains of Umbelopsis ramanniana. The ex-type strain of Micromucor ramannianus var. angulisporus is found to be very close to Umbelopsis vinacea, whereas other isolates identified under the former name in the sense of Linnemann fall in the U. ramanniana subclade. For these isolates, a new species, Umbelopsis angularis, is introduced. Phylogenetic relationships among Umbelopsis species are discussed related to their attributes of the sporangial wall and mature spore shapes.
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- 2003
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36. Morphology of Verticillium dahliae and V. tricorpus on semi-selective media used for the detection of V. dahliae in soil
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J.C. Goud, Walter Gams, and Aad J. Termorshuizen
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food.ingredient ,Hypha ,plant ,Plant Science ,Verticillium ,cotton ,molecular characterization ,food ,Species Specificity ,Biologische bedrijfssystemen ,Botany ,Genetics ,Agar ,Verticillium dahliae ,Mycological Typing Techniques ,Soil Microbiology ,Ecology, Evolution, Behavior and Systematics ,Mycelium ,Biological Farming Systems ,biology ,microsclerotia ,Agriculture ,Fungi imperfecti ,biology.organism_classification ,PE&RC ,Culture Media ,Molecular analysis ,Potato dextrose agar ,Soil microbiology ,Biotechnology - Abstract
The morphology of two soil-borne Verticillium species, V. dahliae and V. tricorpus, was studied on two semi-selective agar media, in the absence and presence of soil. Morphology of the fungi differed considerably between the media, with respect to presence and shape of microsclerotia, dark hyphae (i.e. short melanised hyphae attached to the microsclerotia) and dark mycelium (i.e. melanised mycelium throughout the colony). On modified soil extract agar (MSEA), a pectate based agar, V. dahliae always had globose to elongate microsclerotia, without dark hyphae or dark mycelium, whereas V. tricorpus always had dark hyphae or dark mycelium, and micro sclerotia.. whenever present, were globose to irregular in shape. On ethanol agar (EA), V. dahliae had large microsclerotia and abundant dark hyphae, whereas V. tricorpus did not form microsclerotia, but always abundant dark mycelium. For the first time we observed the formation of dark hyphae by V. dahliae to a great extent. in the presence of soil, most characteristics were less pronounced, and V. dahliae microsclerotia were smaller, but V. tricorpus produced large microsclerotia, even when they were absent in pure culture. Morphological characteristics suitable for discrimination between the two species on MSEA plates in the presence of soil were selected and tested with fresh isolates from agricultural fields. The two fungi could be distinguished using qualitative characteristics and microsclerotial size. Molecular analysis and morphology on potato dextrose agar confirmed all identifications made on soil dilution plates.
- Published
- 2003
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37. [Untitled]
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Johannes Z. Groenewald, Walter Gams, and Pedro W. Crous
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Ramulispora sorghi ,Systematics ,biology ,Plant Science ,Horticulture ,Hyphomycetes ,biology.organism_classification ,Tapesia yallundae ,Mollisia ,Botany ,Eyespot ,Internal transcribed spacer ,Agronomy and Crop Science ,Ribosomal DNA - Abstract
Four species so far classified in Pseudocercosporella or Ramulispora (hyphomycetes) are associated with eyespot disease symptoms of cereals. Two of these have been linked to teleomorphs that were described in Tapesia. Sequence data derived from the Internal Transcribed Spacer region (ITS1, 5.8S and ITS2) of the rDNA operon showed, however, that the eyespot fungi associated with Tapesia are not congeneric with Ramulispora sorghi, the type of Ramulispora. The genus name Tapesia is now rejected in favour of the conserved name Mollisia, which appears to comprise heterogeneous fungi. Tapesia yallundae is not closely related to the type of Mollisia, M. cinerea ,b ut clusters separately, being more closely allied to species with Cadophora anamorphs. A new holomorph genus, Oculimacula, is therefore proposed for teleomorphs of the eyespot fungi, while the anamorphs are accommodated in Helgardia gen. nov.
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- 2003
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38. Clarifications needed concerning the new Article 59 dealing with pleomorphic fungi
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Marc Stadler, Roland Kirschner, Walter M. Jaklitsch, Walter Gams, and Hans-Otto Baral
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media_common.quotation_subject ,Name changes ,LIST-DEMOTED GENERIC NAME ,Biology ,Agricultural and Biological Sciences (miscellaneous) ,ANAMORPH ,Genealogy ,Article ,lcsh:QK1-989 ,International code ,Taxon ,TELEOMORPH ,Genus ,namorph ,lcsh:Botany ,NOMENCLATURE ,Epithet ,Clade ,Nomenclature ,Ecology, Evolution, Behavior and Systematics ,KEW RULE ,media_common - Abstract
The new rules formulated in Article 59 of the International Code of Nomenclature for algae, fungi, and plants (ICN) will cause numerous, often undesirable, name changes, when only phylogenetically defined clades are named. Our task is to name fungal taxa and not just clades. Two suggestions are made here that may help to alleviate some disadvantages of the new system. (1) Officially an epithet coined in a list- demoted genus that is older than the oldest one available in the list-accepted genus would have to be recombined in the accepted genus. We recommend that individual authors and committees establishing lists of protected names should generally not recombine older epithets from a demoted genus into the accepted genus, when another one from pre-2013 is available in that genus. (2) Because the concepts of correlated teleomorph and anamorph genera are often incongruent, enforced congruence leads to a loss of information. Retaining the most suitable generic name is imperative, even when this is subordinated to another, list-accepted, generic name. Some kind of cryptic dual generic nomenclature is bound to persist. We therefore strongly recommend the retention of binomials in genera where they are most informative. With these recommendations, the upheaval of fungal nomenclature ensuing from the loss of the former Art. 59 can be reduced to an unavoidable minimum.
- Published
- 2012
39. Arthroxylaria elegans, a new coprophilous anamorphic fungus allied with the Xylariaceae, with the notes on the genus Bisporostilbella
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Keith A. Seifert, Walter Gams, and Gerry Louis-Seize
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Ecology ,biology ,Genus ,Botany ,Plant Science ,Fungus ,Xylariaceae ,biology.organism_classification ,Ecology, Evolution, Behavior and Systematics - Published
- 2002
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40. Trichodermaspecies associated with the green mold epidemic of commercially grownAgaricus bisporus
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Lisa A. Castlebury, Gary J. Samuels, Orlando Petrini, Walter Gams, and Sarah L. Dodd
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0106 biological sciences ,0301 basic medicine ,biology ,Physiology ,Hypocreales ,Hypocreaceae ,Trichoderma harzianum ,Cell Biology ,General Medicine ,030108 mycology & parasitology ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,03 medical and health sciences ,Hypocrea ,Botany ,Genetics ,Taxonomy (biology) ,Molecular Biology ,Ribosomal DNA ,Ecology, Evolution, Behavior and Systematics ,Trichoderma species ,Agaricus bisporus - Abstract
Trichoderma aggressivum sp. nov. and T. aggressivum f. europaeum f. nov. are described. These forms cause the green mold epidemic in commercially grown Agaricus bisporus in North America and Europe, respectively. In the literature they have been reported as T. harzianum biotypes Th 4 and Th 2, respectively. They are strongly separated from their closest relative, T. harzianum, in sequences of the ITS-1 region of nuclear rDNA and an approximately 689 bp fragment of the protein coding translation elongation factor gene (EF-1α). They are distinguished from the morphologically similar T. harzianum and T. atroviride (the latter also known as biotype Th 3) most readily by rate of growth. Of these, only T. harzianum grows well and sporulates at 35 C, while T. atroviride is the slowest growing. Trichoderma aggressivum f. aggressivum and f. europaeum are effectively indistinguishable morphologically although they have subtly different growth rates at 25 C on SNA and statistically significant micromorphological differences. Based on findings of this study, descriptions of T. harzianum and T. atroviride are expanded. A key to Trichoderma species commonly found associated with commercially grown A. bisporus is provided.
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- 2002
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41. Phylogenetic-based nomenclatural proposals for Ophiocordycipitaceae (Hypocreales) with new combinations in Tolypocladium
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Zengzhi Li, Nigel L. Hywel-Jones, Bhushan Shrestha, Stephen A. Rehner, Richard A. Humber, Yi Jian Yao, Ryan M. Kepler, David P. Hughes, Harry C. Evans, Rasoul Zare, Tatiana Sanjuan, C. Alisha Quandt, Walter Gams, Joseph W. Spatafora, Hiroki Sato, Sayaka Ban, João P.M. Araújo, J. Jennifer Luangsa-ard, and Gi-Ho Sung
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Clavicipitaceae ,Cordyceps ,Ophiocordycipitaceae ,biology ,Ecology ,Hypocreales ,Tolypocladium ,arthropod-pathogens ,new combinations ,Ophiocordyceps ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Article ,Genus ,Polyphyly ,Article 59 ,nomenclature ,Ecology, Evolution, Behavior and Systematics - Abstract
Ophiocordycipitaceae is a diverse family comprising ecologically, economically, medicinally, and culturally important fungi. The family was recognized due to the polyphyly of the genus Cordyceps and the broad diversity of the mostly arthropod-pathogenic lineages of Hypocreales. The other two cordyceps-like families, Cordycipitaceae and Clavicipitaceae, will be revised taxonomically elsewhere. Historically, many species were placed in Cordyceps, but other genera have been described in this family as well, including several based on anamorphic features. Currently there are 24 generic names in use across both asexual and sexual life stages for species of Ophiocordycipitaceae. To reflect changes in Art. 59 in the International Code of Nomenclature for algae, fungi, and plants (ICN), we propose to protect and to suppress names within Ophiocordycipitaceae, and to present taxonomic revisions in the genus Tolypocladium, based on rigorous and extensively sampled molecular phylogenetic analyses. When approaching this task, we considered the principles of priority, monophyly, minimizing taxonomic revisions, and the practical utility of these fungi within the wider biological research community.
- Published
- 2014
42. A revision of Verticillium section Prostrata. IV. The genera Lecanicillium and Simplicillium gen. nov.°)
- Author
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Rasoul Zare and Walter Gams
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Lecanicillium ,biology ,Lecanicillium longisporum ,Nomen novum ,Torrubiella ,Botany ,Lecanicillium muscarium ,Plant Science ,Hyphomycetes ,biology.organism_classification ,Verticillium ,Lecanicillium lecanii ,Ecology, Evolution, Behavior and Systematics - Published
- 2001
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43. ITS and β-tubulin phylogeny of Phaeoacremonium and Phaeomoniella species
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Pedro W. Crous, Ji-Chuan Kang, Walter Gams, and Michelle Groenewald
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Phylogenetic tree ,Plant Science ,Spacer DNA ,Biology ,DNA sequencing ,Phaeoacremonium aleophilum ,Phylogenetics ,Botany ,Genetics ,Phaeoacremonium ,Taxonomy (biology) ,Internal transcribed spacer ,Ecology, Evolution, Behavior and Systematics ,Biotechnology - Abstract
Based on ITS and β-tubulin sequence data of 33 isolates, the newly introduced genus, Phaeomoniella was confirmed as being distinct from Phaeoacremonium (Pm.). Phylogeny inferred from DNA sequences and cultural characteristics also confirmed the species status of Pm. aleophilum and Pm. angustius , which were recently reduced to synonymy. Pm. aleophilum has an optimum growth rate at 30 °C and the ability to grow at 35°, whereas Pm. angustius has an optimum growth rate at 25 °C and does not grow at 35°. Furthermore, ITS and β-tubulin sequence data showed Pm. viticola to be indistinguishable from Pm. angustius , while a new species, Pm. mortoniae , could be distinguished from this complex.
- Published
- 2001
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44. A revision of Verticillium sect. Prostrata. III. Generic classification
- Author
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Rasoul Zare and Walter Gams
- Subjects
biology ,Botany ,Plant Science ,Verticillium ,biology.organism_classification ,Sect ,Ecology, Evolution, Behavior and Systematics - Published
- 2001
- Full Text
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45. A revision of Verticillium sect. Prostrata. II. Phylogenetic analyses of SSU and LSU nuclear rDNA sequences from anamorphs and teleomorphs of the Clavicipitaceae
- Author
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Kathie T. Hodge, Walter Gams, Gi-Ho Sung, Rasoul Zare, and Joseph W. Spatafora
- Subjects
Monophyly ,Clavicipitaceae ,Cordyceps ,biology ,Botany ,Plant Science ,Beauveria ,Clade ,Verticillium ,biology.organism_classification ,Ribosomal DNA ,Ecology, Evolution, Behavior and Systematics ,Engyodontium - Abstract
Parsimony analyses were conducted on partial nucleotide sequences from the small and large subunits of the nuclear ribosomal DNA from representatives of Verticillium sect. Prostrata and related ascomycetes. The majority of species from V. sect. Prostrata were supported as members of the Clavicipitaceae, but they did not form a monophyletic group within the family. Three to six groups of fungi in V. sect. Prostrata were inferred in these analyses and were designated groups B 1- D3 following the convention of Zare et al. (2000). These groups integrated with other anamorph and teleomorph genera including Cordyceps, which was also not supported as being monophyletic. Group B 1 included the anamorph of C. militaris, V.lecanii, V.psalliotae, V.fusisporum, V.aranearum, and V. antillanum. It was part of a larger clade designated Cordyceps s. stricto, which included entomopathogenic species of Cordyceps and anamorphic species of Beauveria, Engyodontium, Microhilum, and Paecilomyces. Group B2 included V. lamellicola, 'Cephalosporium' lanosoniveum, and 'Acremonium' obclavatum and was the most closely related clade to Cordyceps s. stricto. Group C represented a monophyletic clade of nematophagous species that included V. balanoides, V. campanulatum, and V. sinense. It was part of a weakly supported clade designated the C. ophio- glossoides clade, which included fungicolous and entomopathogenic species of Cordyceps and
- Published
- 2001
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46. Report of the Committee for Fungi: 9
- Author
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Walter Gams
- Subjects
Ballot ,Beijing ,Political science ,Opera ,Library science ,Plant Science ,China ,Ecology, Evolution, Behavior and Systematics - Abstract
The previous report of the Committee was published in Taxon 48: 807-810. 1999. The newly accredited Committee for Fungi now consists of the following 15 members: J. L. Crane (Urbana-Champaign, Illinois, U.S.A.), V. Demoulin (Liege, Belgium, chm.), W. Gams (Baarn, Netherlands, secr.), P. M. Kirk (Egham, Surrey, U.K.), P. M. J0rgensen (Bergen, Norway), P. Lizo (Bratislava, Slovakia), P. Nimis (Trieste, Italy), L. Norvell (Portland, Oregon, U.S.A.), E. Parmasto (Tartu, Estonia), G. Redeuilh (Maule, France), S. Ryman (Uppsala, Sweden), G. J. Samuels (Beltsville, Maryland, U.S.A.), T. Schumacher (Oslo, Norway), H. J. Sipman (Berlin, Germany), and Wen-Ying Zhuang (Beijing, China). The present report relates the outcome of a ballot concerning 18 proposals which was completed by all 15 members. The Committee recommends 14 proposals to conserve names, one of these being an alternative to a rejection proposal that was also on the ballot. Two proposals to conserve names are found unjustified. A proposal to place a recent lichenological work on the List of "Opera utique oppressa" has raised vivid debates but received the majority needed for a recommendation. The remaining proposals before the Committee have not yet received an unequivocal vote or have not yet been voted upon.
- Published
- 2001
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47. Cuticular disruption and mortality of Caenorhabditis elegans exposed to culture filtrate of Byssochlamys nivea Westling
- Author
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Krishnapillai Sivasithamparam, Walter Gams, Ja-On Park, Emile L. Ghisalberti, Jaih R. Hargreaves, and Anthony L. J. Cole
- Subjects
Nematology ,food.ingredient ,biology ,Pythium irregulare ,fungi ,food and beverages ,Fungus ,Phytophthora cinnamomi ,biology.organism_classification ,Microbiology ,Rhizoctonia solani ,Nematode ,food ,Fusarium oxysporum ,Agar ,Agronomy and Crop Science ,Ecology, Evolution, Behavior and Systematics - Abstract
A strain of a Byssochlamys nivea, isolated from saline mud in Western Australia as a part of statewide survey of soil fungi for nematophagous activity, was evaluated for its effect on nematodes. Culture filtrate of the fungus grown on potato dextrose broth for 7 days caused structural changes in the cuticle, aggregation of individuals, and mortality of Caenorhabditis elegans. In addition, the culture filtrate completely inhibited hatching of C. elegans eggs. Exudates from agar colonies also caused cuticular disruption and mortality of C. elegans. The cuticular disruption observed, not reported in nematodes before, was initiated in the labial region and spread towards the posterior region of the nematode within 10 min of application. This reaction occurred only in live nematodes. Cuticular disruption and mortality caused by the culture filtrate varied according to growth conditions. The active compound(s) in the culture filtrate were thermostable (100°C for 1 h); however freezing the culture filtrate (-20°C for 2 days) eliminated the activities, as did dialysis (
- Published
- 2001
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48. Always deposit voucher specimens. Open letter to the scientific community of mycologists
- Author
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Reinhard Agerer, Joe Ammirati, Paul Blanz, Régis Courtecuisse, Dennis E. Desjardin, Walter Gams, Nils Hallenberg, Roy Halling, David L. Hawksworth, Egon Horak, Richard P. Korf, Greg M. Mueller, Franz Oberwinkler, Gerhard Rambold, Richard C. Summerbell, Dagmar Triebel, and Roy Walling
- Subjects
Voucher ,Geography ,Library science ,Plant Science ,Ecology, Evolution, Behavior and Systematics - Published
- 2000
- Full Text
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49. Open letter to the scientific community of mycologists
- Author
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Régis Courtecuisse, Dennis E. Desjardin, Roy E. Halling, Paul Blanz, Reinhard Agerer, Roy Watling, Richard C. Summerbell, Joe Ammirati, E. Horak, Gerhard Rambold, Richard P. Korf, Nils Hallenberg, Franz Oberwinkler, David L. Hawksworth, Walter Gams, Greg M. Mueller, and Dagmar Triebel
- Subjects
Systematics ,Ecology ,Soil Science ,Plant Science ,Biology ,Agricultural and Biological Sciences (miscellaneous) ,Genealogy ,Voucher ,Taxon ,Herbarium ,Taxonomy (general) ,Botany ,International Code of Nomenclature for algae, fungi, and plants ,Citation ,Organism - Abstract
To help minimise invalid publication of newly proposed scientific names of fungi, Korf (1995) provided advice on how to guarantee valid publication, and offered a few simple guidelines for authors, reviewers, and editors. He regretted that “unfortunately many of the errors are committed by highly respected mycologists, and published in thoroughly respectable journals” and emphasised that “although the ultimate responsibility for publishing correct names lies with authors, clearly reviewers and editors are shirking their duties to advise authors of such errors prior to publication.” To be published validly, names must be introduced according to requirements of the International Code of Botanical Nomenclature (Greuter et al. 1994, 2000). Since 1990, it has been compulsory to deposit the vouchers for new species and infraspecific taxa, the name-bearing types, in an herbarium or other collection. It is generally accepted that such voucher specimens should be deposited in publicly accessible reference collections such as herbaria. However, voucher collections are invariably necessary, not only when new fungi are described, but also in connection with any scientific study, whether by taxonomists, systematists, physiologists, chemists, molecular biologists, pathologists, ecologists, clinicians, etc., dealing with organisms. It is essential to preserve voucher specimens as dried material and, where possible, as permanently preserved living cultures. When none of the investigated material is preserved, it is impossible to confirm the identity of the investigated taxa. If species concepts change, it is particularly crucial to be able to re-identify the organism at a later time. There are several examples of entities once thought to be species but now revealed as species complexes, i.e., the species concept has been changed, including Pisolithus tinctorius (Burgess et al. 1995) and Paxillus involutus (Fries 1985; Hahn and Agerer 1999). In such cases, re-identification of the original material is necessary to know which organism was studied so that previous work will continue to be relevant. In recent years, molecular biological studies have had a tremendous impact on systematics, taxonomy, and ecology. DNA sequences are frequently obtained from fungal cultures. Too often there is no reference to either an exact citation of the
- Published
- 2000
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50. A revision of Verticillium section Prostrata. V. The genus Pochonia, with notes on Rotiferophthora
- Author
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Walter Gams, Harry C. Evans, and Rasoul Zare
- Subjects
Cordyceps ,Lecanicillium ,biology ,Botany ,Phialide ,Pochonia ,Taxonomy (biology) ,Plant Science ,Hyphomycetes ,biology.organism_classification ,Verticillium ,Ecology, Evolution, Behavior and Systematics ,Conidium - Abstract
A part of the species formerly classified in Verticillium sect. Prostratu is unrelated to the majority subsumed in Lecanicillium on molecular grounds. Most species of this clade have conspicuous dictyochlamydospores (formerly assembled in Diheterospora), while others are distinct only by the tendency to form swollen vegetative hyphae, chromophilic, relatively short conidia, and the lack of crystals. The genus Pochonia which predates Diheterospora is used for this group. The distinctness of I? chlurnyclosporia and f? suchlasporia, each with two varieties, is confirmed. A teleomorph, Cordyceps chlamydosporia, is newly described for the former. Eight anamorph taxa are keyed out, including two new species, f? microbactrosporu and I? rubescen.~. Two species of Rotiferophthom were available for investigation, and their generic distinctness was confirmed. The parasite of rust fungi Verticillium epiphytum and a fungicolous species with conspicuous intercalary chlamydospores, K incurvum, were studied for comparison with Pochonia, but are not formally classified. Verticillium epiphytum is close to but falls outside Pochonia, V incurvum is probably a nectriaceous anamorph. Verticillium pseudohemipterigenum with erect conidiophores bearing numerous tlask-shaped phialides in dense whorls is also not formally reclassified. 4 the
- Published
- 2000
- Full Text
- View/download PDF
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