Ignatova, E.A., E.I. Ivanova
& M.S. Ignatov. 2020. Moss flora of Ulakhan-Chistai Range
and its surroundings (Momsky district, East Yakutia)
Arctoa (2020) 29: 179–194
doi: 10.15298/arctoa.29.12
Moss flora of the Ulakhan-Chistai Range is studied. The range is situated
within Obruchev chain of mountain ranges of Chersky System, forming a watershed between Nera and Moma
Rivers (Indigirka
River basin, Eastern
Yakutia). The studied area, mainly in
the valley of Tirekhtyakh
Creek, was at 64°42'–65°11.5' latitude and 145°32'–146°45' longitude. The
annotated list of mosses includes 325 species, which is the highest number
among the local floras of Yakutia. It is apparently
caused by a great variety of habitats: calcareous and acid rocks (marble,
siltstone, mudstone, sandstone, slate, granite, rhyolite,
etc.), larch forests, alder and Siberian pine thickets, various tundra
communities in alpine belt and on aufeis glades,
mires, lake shores, willow stands in flood valleys, disturbed habitats, places
of reindeer and horse grazing, etc. Wet marble cliffs, especially near
waterfalls, have numerous populations of Andreaeobryum
macrosporum. Other interesting records in
the area include three species of Mielichhoferia
and Coscinodon hartzii,
four species of Meesia, five species of Tetraplodon, four species of Splachnum,
two species of Tayloria, seven species of Didymodon, five species of Tortella,
16 species of Schistidium, and 23 species of
Sphagnum. In one locality Tetraphis pellucida was collected, with is very rare in Yakutia, and at base of steep dry slope to Tirekhtyakh Creek Hilpertia
velenovskyi was found.