Czernyadjeva I.V.1, Cherdantseva V.Ya.2, Ignatov M.S.3, Milyutina I.A.4 2006. Thuidium thermophilum (Thuidiaceae, Bryophyta), a new species from Kamchatka // Arctoa. Vol. 15: 195–202 [in English].

1 Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov str., 2, St. Petersburg, 197376 Russia; e-mail: irinamosses@gmail.com

2 Institute of Biology and Soil Science, Stoletiya Vladivostoka Avenue, 159, Vladivostok 690022 Russia

3 Tsitsin Main Botanical Garden of Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia; e-mail: misha_ignatov@list.ru

4 Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119234 Russia; e-mail: iramilyutina@yandex.ru

KEYWORDS: new species, Thuidium thermophilum, Kamchatka, thermal fields, endemic, genetic differentiation, nrITS, trnL-F

ABSTRACT. A new species, Thuidium thermophilum Czernyadjeva, is described from thermal fields of the Kamchatka Peninsula (Russian Far East). Its diagnostic characters, description, illustrations, and differentiation from the other species of Thuidiaceae are provided. Thuidium thermophilum differs from all other Thuidium species in unipinnate branching, which suggests a closer relationship to Rauiella, but DNA analysis (nrITS and trnL-F) suggest closer relation to Thuidium.

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