TAXONOMIC ANALYSIS OF RARE LICHEN SPECIES, INCLUDED IN THE RED BOOK OF THE CHUVASH REPUBLIC
The article presents the results of a taxonomic analysis of 30 rare lichen species included in the Red Book of the Chuvash Republic. The analysis showed that rare lichens belong to 2 classes (Lecanoromycetes, Arthoniomycetes), 5 orders, 10 families, 19 genera.