Genus Fossombronia (Fossombroniaceae, Marchantiophyta) in the Russian Far East

The genus Fossombronia Raddi in the Russian Far East is reviewed based on herbarium specimens mostly of recent collections. Three species are recognized (F. alaskana Steere & Inoue, F. pusilla (L.) Nees and F. japonica Schiffn.). The descriptions and illustrations based on studied specimens are provided along with the identification key of Fossombronia in the Russian Far East. F. japonica is recorded for the first time in Russia and F. pusilla is the only recent confirmed record of the species in Russia.