Aphyllophoraceous fungi (Basidiomycetes) in the tundra and forest-tundra of the Lena River delta and Novosibirsk Islands (Arctic Yakutia)

Total of 124 species of the aphyllophoroid fungi have been found in the tundra and forest-tundra vicinities of Tiksi and Novosibirsk Isles (Arctic Yakutia). Only 6 species were collected in native conditions of «high Arctic» (northern Arctic tundras), 5 of them belonging to the clavarioid morphological group (83.3 %). The species composition of aphyllophoroid fungi in other subzones of tuntra («low Arctic») is presented in our collections by 46 species, including 56 % of clavarioid and 37 % of corticioid species, poroid and thelephoroid morphological groups making less than 5 % both. 114 species were found in the forest-tundra zone, half of them are corticoid fungi (49 %), whereas the ratio of clavarioid ones is 27 %, that of poroid ones 22 %, and that of thelephoroid ones not over 2 % of species. Similar tendencies in changing the roles of different morphological groups under zonal gradient were described during analysis of the Urals and Mid-European aphyllophoroid fungi too.