V.F. Kuprevich Institute of Experimental Botany NAS of Belarus

The Oymyakon District of the Republic of Sakha (Yakutia), due to the specificity of orography and climate, is of great interest in terms of the study of organisms-extremophiles, namely lichens. The article summarizes and complements the information about 18 rare species of lichens of the Oymyakon District of Yakutia as one of the most severe climatic territories. The climate of the area is continental with little rainfall; the annual amplitude of the maximum and minimum temperatures is 100 °C, the area is located within continuous permafrost. Rare lichen species for Asia (Absconditella sphagnorum, Verrucaria bryoctona) and Eastern Siberia (Lepraria albicans) have been found here. The species Aspilidea myrinii, Brodoa oroarctica, Catapyrenium daedaleum, Stereocaulon lambii, which are rare in Yakutia, occur in single localities only in the Oymyak District. The species Asahinea scholanderi and Masonhalea richardsonii are included in the Red Book of Russia and Yakutia. Lichen Neofuscelia ryssolea is listed in the Red Book of Yakutia as a rare steppe species, and the information about its state in nature is insufficient at present. For each species, the typical morphological characteristics, ecological features, location coordinates, data on habitat, substrate, distribution are indicated. The information about the collector, the author of the definition of the species and herbarium where samples are stored is also provided.

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