Ivanova E.I.1, Ignatova E.A.2, Isakova V.G.1, Balakirev I.A.3, Kuznetsova O.I.4, Ignatov M.S.2,4 2018. Moss flora of the Ust-Nera region in the upper course of Indigirka River, East Yakutia // Arctoa. Vol. 27: 18–28 [in English].

1 – Institute for Biological Problems of Cryolithozone of Siberian Division of Russian Academy of Sciences, 41 Lenin ave., Yakutsk, 677000, Russia; e-mails: bryo.ivanova@yandex.ru & mosses07@rambler.ru

2 – Lomonosov Moscow State University, Biological Faculty, Geobotany Dept., Leninskie Gory Str. 1-12, Moscow 119234 Russia; e-mails: arctoa@list.ru & misha_ignatov@list.ru

3 – Yst-Nera Gymnasium, Kommunisticheskaya, 17, Ust-Nera, Yakutia, Russia; e-mail: i.balak562@mail.ru

4 – Tsitsin Main Botanical Garden, Russian Academy of Sciences, Botanicheskaya Str., 4, Moscow 127276 Russia; e-mail: oikuznets@gmail.com

KEYWORDS: bryophytes, biodiversity, phytogeography, Pseudotaxiphyllum

ABSTRACT. List of 162 moss species collected in the Ust-Nera region (Oimyakon District) is presented. It includes some interesting records of xeric species growing on steep steppe slopes on the banks of Indigirka River and its tributary, Nera River, i.e., Hilpertia velenovskyi and Pterygoneuron kozlovii. In the mountain tundra communities on Taas-Kystabyt Mt. Range (Chersky mountain system) two rare species were found. For Grimmia fuscolutea it is the fifth locality in Russia; it was previously known in the Caucasus, Altai, Baikal Lake area and Kamchatka. Finding of the suboceanic species, Pseudotaxiphyllum elegans, in the area with severely continental climate is quite unexpected; its identity is confirmed by molecular markers.

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doi 10.15298/arctoa.27.02