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A new species, Bacidia fuscopallida Lee & Heo and four new records, B. ekmaniana R. C. Harris, Ladd & Lendemer, B. friesiana (Hepp) Körb., B. heterochroa (Müll. Arg.) Zahlbr. and B. suffusa (Fr.) A. Schneid., are described from South Korea. Bacidia fuscopallida differs from B. diffracta S. Ekman, the most similar species, by warted but non-granular thallus, paler and smaller apothecia without pruina, proper exciple without crystals, over 11-septate ascospores and smaller pycnidia and pycnoconidia. Bacidia ekmaniana is recorded new to Asia, B. heterochroa is reported new to northeastern Asia and B. friesiana and B. suffusa are new to Korea. Molecular analyses employing internal transcribed spacer (ITS) sequences strongly support the classification of the five species of Bacidia. A surrogate key is provided to assist in the identification of all 19 taxa in Bacidia of Korea.

Lendemeriella luteoaurantia B.G. Lee is described as a new lichen species from South Korea. The new species is identified by smaller, yellow-orange apothecia, larger ascospores with wider septum width, and the absence of Cinereorufa-green pigment and teloschistin, different from the closest species, L. aureopruinosa I.V. Frolov, Vondrák, Arup, Konoreva, S. Chesnokov, Yakovczenko and Davydov in morphology and chemistry. Molecular phylogeny employing internal transcribed spacer (nuITS), nuclear large subunit ribosomal RNA (nuLSU), and mitochondrial small subunit (mtSSU) sequences strongly supports the new species as nonidentical in the genus Lendemeriella. A preliminary key is provided to assist in the identification of all 10 species of Lendemeriella.

Two new species, Thelopsis ullungdoensis and Phylloblastia gyeongsangbukensis are described from Ullung-Do (Island), South Korea. The closest relatives from Europe and Korea are epiphytic Thelopsis flaveola which differs by their immersed or semi-immersed yellow ascomata, ascospores without halo and their habitat of smooth bark (mainly Fagus) in humid and cold climates. Thelopsis gangwondoensis differs by its bigger semi-immersed ascomata (600–700 µm in diam.), oblong halonate ascospores (8–12 × 6–8 µm) and its habitat of smooth bark of deciduous trees. P. gyeongsangbukensis differs from its relatives within the genus in having 5-septate ascospores (22–26 × 6–8 µm), semi-immersed, subglobose ascomata with a flattened top (250–400 µm) and a thin, matt, uneven gray-brown to gray-green continuous thallus without isidia.

Orientophila corticola is described as a new lichen-forming fungus from South Korea. The new species is distinguishable from other Orientophila species by the substrate preference to tree barks and the habitat specificity to inland areas. Molecular analyses applying internal transcribed spacer (ITS) and mitochondrial small subunit (mtSSU) sequences clearly classify O. corticola as a distinct species in the genus Orientophila. A surrogate key is provided to assist in the identification of all 13 taxa in the genus Orientophila.

Rinodina salicis Lee & Hur and Rinodina zeorina Lee & Hur are described as new lichen-forming fungi from forested wetlands or a humid forest in South Korea. Rinodina salicis is distinguishable from Rinodina excrescens Vain., the most similar species, by its olive-gray thallus with smaller areoles without having blastidia, contiguous apothecia, non-pruinose discs, paler disc color, wider ascospores in the Pachysporaria-type II, and the absence of secondary metabolites. Rinodina zeorina differs from Rinodina hypobadia Sheard by areolate and brownish thallus, non-pruinose apothecia, colorless and wider parathecium, narrower paraphyses with non-pigmented and unswollen tips, longer and narrower ascospores with angular to globose lumina, and the absence of pannarin. Molecular analyses employing internal transcribed spacer (ITS) sequences strongly support the two new species to be unique in the genus Rinodina. An updated key is provided to assist in the identification of all 63 taxa in Rinodina of the far eastern Asia.

Arthonia dokdoensis sp. nov., a lichenicolous fungus from the subcosmopolitan Arthonia molendoi complex growing on crustose thalli of species of the genus Orientophila (subfamily Xanthorioideae, Teloschistaceae), as well as the lichen species Rufoplaca toktoana sp. nov. (subfamily Caloplacoideae, Teloschistaceae) similar to Rufoplaca kaernefeltiana, both from Dokdo Islands, Republic of Korea, are described, illustrated, and compared with closely related taxa. In the phylogenetic tree of the Arthoniaceae based on 12S mtSSU and RPB2 gene sequences, the phylogenetic position of the A. dokdoensis and the relationship with the A. molendoi group are illustrated, while the position of the newly described R. toktoana is confirmed by phylogenetic tree based on ITS nrDNA data.

Psoroglaena humidosilvae Lee is described as a new lichen species from a wetland forest in South Korea. The new species is distinct from P. stigonemoides (Orange) Henssen by little projections locally present on the thallus; smaller, paler, and globose perithecia; smaller asci; and smaller ascospores generally 3-septate. Molecular analyses employing internal transcribed spacer (ITS), mitochondrial small subunit (mtSSU), and nuclear large subunit ribosomal RNA (LSU) sequences strongly support P. humidosilvae as a nonidentical species in the genus Psoroglaena. A surrogate key is provided to assist in the identification of all 22 species of Psoroglaena.

Eighteen new to science species, i.e.: 13 taxa from South Korea (Astroplaca loekoesiana S. Y. Kondr., E. Farkas, J.-J. Woo et J.-S. Hur, Buellia ulleungdoensis S. Y. Kondr., L. Lőkos et J.-S. Hur, Candelariella hakulinenii S. Y. Kondr., L. Lőkos et J.-S. Hur, Flavoplaca laszloana S. Y. Kondr. et J.-S. Hur, Lichenostigma epiporpidiae S. Y. Kondr., L. Lőkos et J.-S. Hur, Mikhtomia geumohdoensis S. Y. Kondr., Liu D. et J.-S. Hur, Orientophila dodongensis S. Y. Kondr., L. Lőkos et J.-S. Hur, Physcia orientostellaris S. Y. Kondr., L. Lőkos et J.-S. Hur, Placynthiella hurii S. Y. Kondr. et L. Lőkos, Protoparmeliopsis kopachevskae S. Y. Kondr., L. Lőkos et J.-S. Hur, Psoroglaena sunchonensis S. Y. Kondr., L. Lőkos et J.-S. Hur, Rufoplaca kaernefeltiana S. Y. Kondr., L. Lőkos et J.-S. Hur, Vezdaea poeltiana S. Y. Kondr., L. Lőkos, J. Halda et J.-S. Hur), two species from India (Rusavskia indica S. Y. Kondr. et D. K. Upreti, and R. upretii S. Y. Kondr., G. K. Mishra et S. Nayaka), and two species from Atlantic Eur...

Lecanora baekdudaeganensis Lee & Hur is described as a new lichenized fungus from Baekdudaegan Mountains, South Korea. The new species is classified into the Lecanora subfusca group – allophana type and distinguishable from Lecanora imshaugii Brodo by a darker thallus, brownish disc, K–insoluble granules on the surface of the epihymenium, shorter hypothecium, and the presence of oil droplets in the apothecial section. Molecular analyses employing internal transcribed spacer (ITS) and mitochondrial small subunit (mtSSU) sequences strongly support Lecanora baekdudaeganensis as a distinct species in the genus Lecanora. A surrogate key is provided to assist in the identification of all 52 taxa in the genus Lecanora of Korea.

Arthonia coreana, Arthonia superpallens, and Arthonia zelkovae are new species from South Korea. All new species are in the Euarthonia tribe, based on the key characteristics of colorless hypothecium and multi-cellular spores. A. coreana has a dull brownish hypophloedal thallus without bleaching and rounded or curved big apothecia in comparison with those of Arthonia punctiformis. A. coreana consistently exhibits 4-septate ascospores, which is a distinctive characteristic that distinguishes it from other Arthonia species. A. superpallens has a white-greenish thallus, pale yellowish apothecia, and a trentepohlioid alga. However, A. superpallens has no distinct prothallus, adnate, and convex apothecia, no pycnidia, and is UV-, in contrast with related species in the Arthonia antillarum group. A. zelkovae has a white, epiphloedal thallus, brownish-black epruinose apothecia covered with a whitish bark layer, and smaller ascospores in comparison with those of A. punctiformis. A. zelkovae consists of a chlorococcoid alga, which differs from related Arthonia species such as A. punctiformis, Arthonia pinastri, and Arthonia glaucella. Although A. zelkovae is similar to Arthonia dispersa in its white-colored thallus, blackish apothecia, and the presence of a chlorococcoid photobiont, A. zelkovae differs from the latter in having larger-sized 3-septate ascospores. Arthonia cinnabarina f. marginata, A. glaucella, Arthonia ilicinella, Arthonia lapidicola, Arthonia leioplacella, Arthonia pertabescens, A. pinastri, Arthonia spadicea, and Arthonia stellaris are newly described in Korea. The diagnostic characteristics of these species are discussed and presented. An artificial key is provided to facilitate identification of Arthonia species from Northeast Asia.

Data on 54 new for China, India, Korea and Russia species of lichen-forming and lichenicolous fungi, including 22 new for science taxa of lichen-forming and lichenicolous fungi, i.e.: Acarospora ulleungdoensis, Amandinea trassii, Aspicilia geumodoensis, Biatora ivanpisutii, Caloplaca patwolseleyae, Catillaria ulleungdoensis, Coenogonium agonimieoides, Gyalidea austrocoreana, G. ropalosporoides, Opegrapha briancoppinsii, O. ulleungdoensis, Phyllopsora loekoesii, Psoroglaena coreana, Psorotichia gyelnikii, Rinodina oxneriana, Scoliciosporum jasonhurii, Staurothele oxneri, Stigmidium coarctatae, Thelocarpon ulleungdoense, Thelopsis loekoesii, Toninia poeltiana, Unguiculariopsis helmutii, and and 7 new species to China (Caloplaca ussuriensis, Megaspora rimisorediata, Rinodina xanthophaea, Rusavskia dasanensis, Xanthoria splendens, Zeroviella coreana, Z. esfahanensis), and 1 new species to India (Zeroviella esfahanensis), and 24 new species to Korea (Agonimia blumii, Arthonia rinodinicola, Buelliella minimula,...

Data on about 27 new for South Korea species of lichen-forming and lichenicolous fungi, including one new for science genus Verseghya and 11 new for science species, i.e.: Agominia loekoesii, Lecanora pseudosambuci, Nectriopsis verseghyklarae, Polysporina golubkovae, Protoparmeliopsis zerovii, Psoroglaena chirisanensis, Pyrenopsis chejudoensis, Ropalospora chirisanensis, Thelopsis chirisanensis, Trapelia coreana, and Verseghya klarae, as well as 27 taxa newly recorded for the country (Biatora aff. subduplex, Buellia cf. uberior, Caloplaca kedrovopadensis, Catillaria chalybaea, Coenogonium isidiatum, Dibaeis yurii, Halecania australis, H. lobulata, Intralichen christiansenii, Ivanpisutia oxneri, Lecania cf. olivacella, Lecanora lojkahugoi, L. sulphurea, Lecidella mandshurica, Lichenoconium erodens, Micarea lithinella, M. aff. stipitata, Muellerella pygmaea var. pygmaea, Oxneria alfredii, Pertusaria aff. flavocorallina, Phaeosporobolus alpinum, Polycoccum innatum, Porina fluminea, Rinodina xanthophaea, Ropa...