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The impact of silvicultural management on the populations of epiphytes in pine-oak forest was evaluated in an area of Oaxaca State in Mexico, where the Method for Silvicultural Development (MSD) is practiced. Sampling was carried out in 5 management categories and their border areas (-B): Reforestation with Pine only (RP, RP-B), Reforestation with Pine with Nurse Trees (RPNTr, RPNTr-B), Harvest and Regeneration in Stands (HRSt, HRSt-B), areas where a First Thinning has been carried out (1stThin, 1stThin-B) and Conservation areas (CONSV, with no border area). Four transects measuring 50 x 4 m were set up in each management category of which 2 were in the managed area and 2 in the border area. A total of 32 tree species acting as phorophytes hosting epiphytes, and 31species of epiphytes were recorded (15 orchids, 5 bromeliads and 11 ferns). There was significantly greater abundance of epiphytes in the categories 1stThin-B (2353 ind.) and CONSV (2195 ind.) compared to RPNTr (67 ind.) and RP with only 18 individuals. There was a significant difference between management categories for the abundance of orchids and ferns but not for bromeliads. Rhynchostele aptera (Orchidaceae), Tillandsia violacea (Bromeliaceae) and Polypodium sp. (Polypodiaceae) were common throughout the study area, whereas Alamania punicea, Lepanthes schiedei, Rhynchostele cordata (Orchidaceae), Asplenium cuspidatum (Aspleniaceae), Elaphoglossum peltatum (Dryopteridaceae) and Ceradenia oidiophora (Polypodiaceae) were only found in a single category of silvicultural management or conservation area. The biodiversity indices used (Shannon-Weiner, Simpson and True Diversity), indicated that HRSt and CONSV were the most diverse, and RP and RPNTr the least diverse categories. The phorophytes with the greatest abundance of epiphytes were Quercus crassifolia, Ternstroemia lineata and Rapanea juergensenii. We conclude that the silvicultural management category Harvest and Regeneration in Stands (HRSt) favors the conservation of epiphytes, that trees of the genus Quercus are the best phorophytes, that Pinus ayacahuite is a phorophyte for a variety of species especially orchids whereas Pinus patula is a relatively poor phorophyte, and suggest that the borders of managed areas, and reforestation with a diversity of tree species make an important contribution to epiphyte conservation. [ABSTRACT FROM AUTHOR]

The article presents a study on the genetic variability of Quercus grisea Liebm in Sierra Fria, Aguascalientes, Mexico. Using nuclear microsatellites, the study identifies the pattern of gene flow between populations and defines populations important for ecological conservation. It discovers the effectiveness of processes of pollination and dispersal in maintaining genetic diversity. It concludes that Q. grisea's genetic variability is high but populations is not genetically structured.

Disholcaspis Dalla Torre & Kieffer, 1910 is reviewed for the first time in Mexico. A total of 23 species have been studied, 12 previously known species, 11 new species, and one new synonym: D. brasoae Cuesta-Porta, sp. nov., D. callosa Pujade-Villar, Kinsey† & Cuesta-Porta, sp. nov., D. carpenteri Pujade-Villar, Cuesta-Porta & Melika, sp. nov., D. cinerosa (Bassett, 1881) (= D. pallens Kinsey, 1938 syn. nov.), D. cordifoliae Cuesta-Porta, Pujade-Villar & Kinsey†, sp. nov., D. crystalae Pujade-Villar, 2018, D. cummingi Pujade-Villar, Melika & Cuesta-Porta, sp. nov., D. familiaris Cuesta-Porta, sp. nov., D. hermesi Cuesta-Porta, Pujade-Villar & Melika, sp. nov., D. insulana Kinsey, 1938, D. laetae Kinsey, 1937, D. largior Kinsey, 1938, D. mexicana (Beutenmüller, 1911), D. nayeliae Cuesta-Porta, Melika & Pujade-Villar, sp. nov., D. potosina Kinsey, 1937, D. pulla Kinsey, 1937, D. punicea Pujade-Villar, Kinsey† & Cuesta-Porta, sp. nov., D. purlans Kinsey, 1937, D. purpurea Kinsey, 1937, D. puta Kinsey†, Cuesta-Porta & Pujade-Villar, sp. nov., D. raptor Pujade-Villar, Kinsey † & Cuesta-Porta, sp. nov., D. regina Kinsey, 1937, and D. unicolor Kinsey, 1920. We provide the descriptions of the new species, the re-descriptions of the previously known species, diagnoses and the first key to species for the Mexican Disholcaspis.