The УLedyanaya BayФ key plot is situated in the centre of Taimyr Peninsula (74∞32Т Ц 74∞54Т N, 99∞13Т Ц 100∞11Т E) on southern slope and on foothills of Byrranga Range. The local moss flora of Byrranga is investigated for the first time. It includes 233 species, 1 subspecies and 5 varieties of mosses. Richness of this moss flora much exceeds any of previously studied local floras of Taimyr. Annotated check-list includes species frequency, habitat characteristics and associated species. Forty eight species, 1 subspecies and 1 variety have found in Taimyr Peninsula for the first time. Moss composition of the main mesohabitats is described.