Ignatov M.S.1, Ivanova E.I.2, Ignatova E.A.3, Krivoshapkin K.K.4 2001. On the moss flora of Ust-Maya District (Republic Sakha/Yakutia, East Siberia) // Arctoa. Vol. 10: 165–184 [in English].

1 Tsitsin Main Botanical Garden of Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia

2 Institute of Biology of Permafrost-Zone, Lenina str. 41, Yakutsk 677000 Russia

3 Biological Faculty, Moscow State University, Moscow 119234 Russia

4 Yakutsk State University, Dept. of Botany, Belinskogo 58, Yakutsk 677016 Russia

KEYWORDS: bryophytes, flora, Yakutia, new records, phytogeography, biodiversity.

ABSTRACT. The result of study of collections from 16 localities in Ust-Maya District is presented. 253 species were found; their list is annotated by altitudinal and habitat data. Localities of some species extend their ranges considerably: Plagiothecium berggrenianum, Hypnum saitoi, Indusiella thianschanica, Bardunovia baicalensis, Didymodon hedysariformis, etc. Nomenclatural novelties are: Orthotrichum iwatsukii Ignatov, nom. et stat. nov. [=O. macounii var. japonicum Iwats., O.  laevigatum Zett. var. japonicum (Iwats.) Lewinsky] and Pylaisia steerei (Ando & Higuchi) Ignatov [=Pylaisiella steerei Ando & Higuchi].

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