Ignatov M.S.1,2, Ignatova E.A.1, Ivanova E.I.3, Ivanov O.V.4, Bysyin N.A.5 2018. On the distribution of Andreaeobryum in Russia // Arctoa. Vol. 27: 112–118 [in English].

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

2 – Tsitsin Main Botanical Garden, Russian Academy of Sciences, Botanicheskaya Str., 4, Moscow 127276 Russia.

3 – 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

4 – P.N. Lebedev’ Institue of Physics of Russian Academy of Sciences, Leninsky 53, Mosсow 119991 Russia, e-mail: ivanov@td.lpi.ru

5 – Nature Protection Service of Tomponsky District of Republic of Sakha (Yakutia), Lesnaya str., 6-74, Khabdyga, Tomponsky Distr., Yakutia, Russia.

Keywords: bryophytes, biodiversity, Yakutia, rare species, spore production

ABSTRACT. Andreaeobryum macrosporum was considered as endemic to North America until 2015 when it was found in Yakutia. Only one locality was discovered in 2015, thus later we attempted to find out more details on its distribution, habitats and spore production. A focused search revealed a number of additional localities within two regions: in the Sette-Daban Range, within the area about 50 ´ 50 km, and in Ulakhan-Chistai Range, in the marble ridge, within the square 3 ´ 5 km. Only sufficiently wet and semi-exposed habitats are suitable for abundant sporophyte production, although the species may occur in drier areas, albeit it is usually overgrown by algae and lichens. The collections were gathered from 440 to 1400 m elev., but observations of adjacent distant slopes suggest its occurrence up to at least 1500–1600 m. In Ulakhan-Chistai Range, Andreaeobryum grows in virtually every stream running among cliffs, whereas in Sette-Daban its localities are few, and extensive search is required to find them. Both areas are sharply delimited, due to different bedrocks, namely quartzites and shists, in surrounding mountain ranges.

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Doi 10.15298/arctoa.27.11