Liverworts of the Torgovaya river basin (Subpolar Urals, Komi Republic)

Flora of liverworts was for the first time studied on the Torgovaya River Basin (Subpolar Urals, Komi Republic, «Yugyd Va» national park). Collected list includes 40 taxa from 25 genera, 16 families, five orders, two classes. Annotated list is provide. The species diversity of the liverworts of Torgovaya River is 70% of the northern part of the Subpolar Urals flora. 37 species are first cited for the investigated flora. All species were previously found in the Subpolar Urals. The level and number of knowledge on liverworts occurring in the basin of Torgovaya River is expected to increase with further investigations. The studied liverwort flora was analyzed. Anastrophyllaceae has the highest level of species diversity (8 species). Scapaniaceae and Lophoziaceae includes seven species each. Among the genera, the highest diversity was found for Scapania (6 species) and Lophozia (5). Arctoborealmontane (22 species), arctomontane (7) and boreal (6) species are most numerous there. The rates of circumpolar and nearly circumpolar liverworts are very high (97.5% all species). Most of the identified liverworts prefer to grow in habitats with moderate moisture conditions (80% all species) and low substrate acidity (85%). The structure (taxonomic, geographical and ecological) of the studied flora exhibits mountain features. It is similar to that of the northern part of the Subpolar Urals.