New findings of aphyllophoroid fungi from the Kaluzhskie Zaseki State Nature Reserve (Kaluga Region, Russia)

New data on species richness and ecology of lignicolous aphyllophoroid fungi (Agaricomycetes, Basidiomycota) inhabiting the old-growth mesic broad-leaved forest of the Kaluzhskie Zaseki State Nature Reserve (Central Russian Upland, European part of Russia) is presented. A list of 46 species new to Kaluga Region is annotated with data on occupied woody substrates, collection numbers of herbarium specimens and brief distributional notes. Among them Thanatephorus ochraceus is a new species to the European part of Russia, Athelia cystidiolophora, Leucogyrophana sororia, Phlebia subulata, Skeletocutis kuehneri, Steccherinum pudorinum, and Tomentella lapida are registered for the first time for the Central Russian Upland. New localities of rare and little-known in Europe species, such as Aporpium macroporum, Hyphoderma incrustatum, Kneiffiella abdita, Peniophorella clavigera, Riopa metamorphosa, Sistotrema porulosum, and Yuchengia narymica, are revealed.