Species compsition, taxonomic structure and substrate ecology of myxomycetes in the Gorgany Nature Reserve (Ivano-Frankivsk region, Ukraine) were investigated. In the territory of the park 64 species (66 intraspecific taxa) of Myxomycota were found, including into 25 genera, 10 families and 6 orders. Species diversity of myxomycetes on substrates, formed by various species of trees, does not correlate with the abundance of these plants in the reserve. Extrazonal plant species demonstrate low diversity of associated species of myxomycetes. Analysis of the pH impact on the diversity of corticolous myxomycetes has shown the presence of two peaks of abundance (pH 4,8–5,2 and 6,2–6,8), corresponding to the bark of coniferous and deciduous trees. Between these two peaks, the diversity of myxomycetes was reduced. Among studied species, 18 ones are new for the Carpathian Forests zone of Ukraine; Arcyria major, Cribraria oregana, Comatricha variabilis, Licea pygmaea and Echinostelium paucifilum were found in Ukraine for the first time. Descriptions, locations data and microphotographs are provided for these species.

Keywords: moist chamber culture, substrate specialization, pH of tree bark, species new for Ukraine

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