Schistidium frahmianum (Bryopsida, Grimmiaceae), a new arctic species from Beringia

摘要: Schistidium frahmianum Ochyra & Afonina sp. nov . is described and illustrated as a new species from Chukotka in the Russian Far East Alaska North America. The belongs within subg. Canalicularia closely related to S. agassizii Sull. Lesq. but immediately distinct its costa which longly excurrent stout terete subula variously bistratose laminal cells at leaf shoulders. an Arctic restricted occurrence Beringia.