Abstract

The studies of extensive collections from the Upper Bureya River reveal two mosses which are describing. Zygodon sibiricus is close to Z. rupestris, but differ in presence of single peristome. It is widespread throughout the South Siberia and Russian Far East. Actinothuidium hookeri ssp. boreale differs from A. hokeri ssp. hookeri (widespread in Himalayas and Southern China) in longer leaves and the presence of central strand. This subspecies occurs in Russian Far East, North-East China (Heilongjang), Korea and Central China (Kansu and Quinhai).