Dichelyma (Fontinalaceae, Bryophyta) in Russia

Abstract

Four species of Dichelyma are known at present in Russia: D. capillaceum (With.) Myrin, D. falcatum (Hedw.) Myrin, D. japonicum Cardot and D. uncinatum Mitt. The latter species is newly reported for the country. It was discovered in herbarium collections from Commander Islands (Kamchatsky Territory), Chukotka and Anabar Plateau (Krasnoyarsk Territory, Taimyr District). All these specimens were previously identified as D. capillaceum. Distribution of the latter species in Russia is restricted to central and northern parts of European Russia and West Siberia (middle course of Ob River). Dichelyma falcatum is not rare in the northern part of European Russia and in montane areas of southern Siberia, southern Taimyr and Chukotka, known also in central European Russia (south to Tver Province), Urals, West Siberia, Republic Sakha (Yakutia), and Kamchatka. Dichelyma japonicum is known from a single locality in Iturup Island (Kuril Islands). Key to identification, descriptions, data on distribution in Russia and ecology are provided for all species, illustrations of D. capillaceum and D. uncinatum are also included.