Ignatova E.1, Bednarek-Ochyra H.2, Afonina O.3, Muñoz J.4 2003. A new species of Grimmia (Grimmiaceae, Musci) from north-east Asia and Alaska // Arctoa. Vol. 12: 1–8 [in English].

1 Biological Faculty, Moscow State University, Moscow 119234 Russia

2 Laboratory of Bryology, Institute of Botany, Polish Academy of Sciences, ul. Lubicz 46, 31–512 Kraków, Poland

3 Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov str., 2, St. Petersburg, 197376 Russia

4 Real Jardin Botanico, Plaza de Murillo 2, E-28014 Madrid, Spain

KEYWORDS: Grimmia jacutica, Grimmia leibergii, Grimmiaceae, bryophytes, mosses, taxonomy, Siberia, Beringian distribution.

ABSTRACT. Grimmia jacutica is described as a new species. This species seems to be quite common in East Siberia and occurs also in some neighboring areas, ranging eastwards to Chukotka and Alaska. Many characters of G. jacutica are similar to Racomitrium species in the R. heterostichum group, and many specimens were found in herbaria under various names of Racomitrium. However the closest relative of G. jacutica is probably a Western North American endemic species G. leibergii Paris. The comparison between these two taxa and the detailed illustration of G. jacutica are given, and the distribution of G. jacutica is mapped.

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