ИСТИНА

Overview of the recent studies on Orthotrichoid mosses in Russia is provided. Recently presented novelties, contribute to the certain biogeographic pattern, indicating three different Orthotrichoid floras, changing along longitudinal gradient. «European» one in Russia is poorly represented; most European species are concentrated in locally humid areas of West Caucasus. Unlike European one, continental Asian Orthotrichoid flora is still poorly known, and few years ago we did not know the proper names even for the widespread species. The Siberian specimens being referred to European species in most cases represent other, poorly known or even undescribed species. North Pacific Region houses peculiar and poorly understood hot spot of diversity of Orthotrichoid mosses. Thus, these hot spots are obligatory to be sampled in revision of particular groups, since they likely comprise under-recorded cryptic- or semicryptic endemics. Latitudinal gradient also contributes to spatial differentiation of Eurasian Orthotrichoid flora.