Fedosov V.E.1, Ignatova E.A.1, Ivanov O.V.2 2009. Orhotrichum holmenii Lewinsky-Haapasaari (Orthotrichaceae, Musci), a new species for Russian moss flora // Arctoa. Vol. 18: 195–200 [in English].

1 Biological Faculty, Moscow State University, Moscow 119234 Russia; e-mails: fedosov_v@mail.ru, arctoa@list.ru

2 Lebedev Institue of Physics of Russian Academy of Sciences, Leninsky Avenue, 53, Mosñow 119991 Russia; e-mail: ivanov@td.lpi.ru

KEYWORDS: Orthotrichum, Bryophyta, Siberia, Taimyr, European Arctic, disjunction.

ABSTRACT. Orthotrichum holmenii Lewinsky-Haapasaari is found in Russia for the first time, in European Arctic (Adzva River, Nenetzky Autonomous District) and Siberian Subarctic (Maimecha River, the southern Taimyr). Previously the species was known only from the type locality in Kazakhstan, vicinity of Alma-Ata, 3400 km and 3000-3400 km from the new localities. The description, illustrations and differentiation from similar species are provided. Orthotrichum holmenii differs from other species of the genus by the combination of naked calyptra, exserted, distinctly ribbed capsules with stomata slightly to moderately covered by subsidiary cells, exostome teeth reflexed when dry and not paired when old, and 16 long papillose endostome segments.

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doi 10.15298/arctoa.18.13