Fedosov V.E.1, Doroshina G.Ya.2, Tubanova D.Ya.3, Afonina O.M.2 & Ignatova E.A.1 2017. On four Orthotrichaceae species new for Russia // Arctoa. Vol. 26 (2): 154–165 [in English].

1 Lomonosov Moscow State University, Faculty of Biology, Geobotany Dept., Leninskie Gory Str. 1-12, Moscow 119234 Russia

2 V.L. Komarov Botanical Institute Rus. Acad. Sci., Prof. Popov Str., 2, St. Petersburg, 197376 Russia

3 Institute of General and Experimental Biology SB RAS, Sakhjanovoy str., 6, Ulan-Ude, 670047 Russia

KEYWORDS: Lewinskya transcaucasica, Orthotrichum crenulatum, Orthotrichum tenellum, Zygodon dentatus, biodiversity; biogeography, Russia

ABSTRACT. A revision of Russian specimens of the family Orthotrichaceae brought numerous new records in the genera Zygodon, Lewinskya and Orthotrichum, including four species new to Russia. Lewinskya transcaucasica, recently described from Georgia, is found in Dagestan Republic (East Caucasus) and Altai Mts. In addition, specimens identified as L. striata from Siberia and Russian Far East were found to be similar to L. transcaucasica in ovate, emergent to short exserted capsules and pairwise arranged exostome teeth, but differing from the latter in typically sixteen endostome segments and somewhat smaller spores. Central Asian Orthotrichum crenulatum was revealed in Buryatia, Zabaikalsky Territory, and Kotuyskoe Plateau; mostly European O. tenellum was found in the West Caucasus, Sochi surroundings; Zygodon dentatus was collected in Karachaevo-Cherkessia (West Caucasus). Species descriptions and illustrations based on Russian specimens, as well as data on their ecology and distribution are provided.

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doi: 10.15298/arctoa.26.15