| الملخص: | This paper provides the results of a study on fungal species diversity in the active and permafrost layers of peatlands within frozen peatbogs in the flatland areas of the cryolitozone, European Northeast of Russia (forest-tundra zone, southern and northern tundra subzones). Fungal taxonomic list includes eighty-three species from seventeen genera and two forms of <i>Mycelia sterilia</i>. The phylum <i>Mucoromycota</i> is represented by fifteen species (18% of total isolate number), and these species exhibit the following distribution by genus: <i>Mucor</i> (four), <i>Mortierella</i> (seven), <i>Umbelopsis</i> (three), <i>Podila</i> (one). <i>Ascomycota</i> is represented by sixty-eight species from thirteen genera. The genus <i>Penicillium</i> dominates the species saturation (thirty-seven species, 44%). Soil microfungal complex is represented by rare species (51%), random species (32%), frequent species (15%), and dominant species (2%). In peat soils, dominant species are <i>Penicillium canescens</i> (72%) and non-pigmented (albino) <i>Mycelia sterilia</i> (61%); abundant species are <i>Talaromyces funiculosus</i> (41%), <i>Pseudogymnoascus pannorum</i> (36%), albino <i>Mycelia sterilia</i> (29%), <i>Umbelopsis vinacea</i> (25%), <i>Mortierella alpina</i> (17%), <i>Penicillium decumbens</i> (21%), <i>P. spinulosum</i> (20%), and <i>P. canescens</i> (17%). In active layers of peat soils, abundant species are <i>Penicillium thomii</i> (14%), <i>Mycelia sterilia</i> (13%), <i>Penicillium spinulosum</i> (13%), <i>Penicillium simplicissimum</i> (13%) in forest-tundra; <i>Talaromyces funiculosus</i> (21%), albino <i>Mycelia sterilia</i> (15%), <i>Umbelopsis vinacea</i> (14%) in southern tundra; <i>Penicillium decumbens</i> (23%), <i>P. canescens</i> (17%), <i>P. thomii</i> (13%) in northern tundra. In permafrost peat layers, abundant species are <i>Penicillium spinulosum</i> (17%), <i>Talaromyces funiculosus</i> (34%), and <i>Umbelopsis vinacea</i> (15%) in forest-tundra; <i>Pseudogymnoascus pannorum</i> (30%) and <i>Mortierella alpina</i> (28%) in southern tundra; <i>Pseudogymnoascus pannorum</i> (80%) in northern tundra.
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