On the moss flora of Khangalassky District (Republic of Sakha/Yakutia, East Siberia)

Abstract

New and previously known data on the moss flora of Khangalassky District are summarized. The list of mosses includes 232 species, 59 of them are newly recorded for this territory. Territory of the district is situated in Central Yakutia, along the middle course of Lena River. There is the Nature park "Lena Pillars" known by vertical limestone cliffs up to 100 m high stretching for ca. 80 km along the right bank of Lena River. They host a number of species with generally more southern distribution, e.g., Anomodon minor, Brachythecium buchananii, Fabronia ciliaris, Homalia trichomanoides, Homomallium incurvatum, Leucodon sciuroides, Entodon schleicheri, Oxyrrhynchium hians, Philonotis falcata, Plagiomnium acutum, Trachycystis ussuriensis, etc. A unique combination of habitats provides environments for co-existence side-by-side of hygrophilous, mesic, and xeric moss species. New localities of some rare species were revealed. Indusiella thianschanica and Jaffueliobryum latifolium, previously known only in one locality near Labyja Creek mouth, were found on dry cliffs and dry rock outcrops on the left bank of Lena River. Myrinia rotundifolia, known from few localities in the north of Yakutia and in Taimyr, appeared to be abundant on moist rock ledges just near the water on the left bank of Lena River. Fissidens arcticus was collected several times on rock ledges covered with soil along the river and on soil in Salix thickets on the river island. Rare epigeic species, Pterygoneurum kozlovii and Hennediella heimii, were collected in the eastern part of the district, on cryogenic hills (boolgunnyakhs) covered by low grass meadow. РезюмеОбобщены ранее известные и новые данные по бриофлоре Хангаласского улуса. Список мхов насчитывает 232 вида, 59 из них приводятся впервые для его территории. Территория улуса расположена в Центральной Якутии, в среднем течении р. Лена, где находится природный парк "Ленские Столбы", известный благодаря высоким, до 100 м, отвесным известняковым скалам, тянущимся на 80 км по правому берегу. Здесь были найдены многие виды, имеющие в целом более южное распространение: Anomodon minor, Brachythecium buchananii, Fabronia ciliaris, Homalia trichomanoides, Homomallium incurvatum, Leucodon sciuroides, Entodon schleicheri, Oxyrrhynchium hians, Philonotis falcata, Plagiomnium acutum, Trachycystis ussuriensis и др. Уникальное сочетание природных условий обуславливает произрастание в непосредственной близости друг от друга болотных, мезофильных лесных и ксерофильных степных видов. Для некоторых редких видов выявлены новые местонахождения. Indusiella thianschanica и Jaffueliobryum latifolium, собранные ранее только на скалах в устье р. Лабыйа, были найдены на сухих скалах и скальных выходах на левом берегу Лены. Myrinia rotundifolia, известная из немногих местонахождений на севере Якутии и на Таймыре, найдена в большом количестве на сырых скальных плитах у самой воды по берегу р. Лены, на левом берегу. На почве, покрывающей полочки скал по берегам Лены, а также на почве в ивняках со свидиной на ос...

Moss flora of the Ust-Nera region in the upper course of Indigirka River, East Yakutia

“…A similar compex of interesting species was revealed in Yana-Adycha moss flora: Hilpertia velenovskyi, Pterygoneuron kozlovii, Syntrichia caninervis, and Fabronia ciliaris (Isakova, 2010). Хeric mosses revealed by Ivanova et al (2017) in Central Yakutia include Indusiella thianschanica, Jaffueliobryum latifolium, Syntrichia pagorum, Microbryum davallianum, and Pterygoneurum kozlovii. Also Hilpertia velenovskyi, Indusiella thianschanica, Jaffueliobryum latifolium, Pterygoneurum kozlovii, Tortella densa and Microbryum starckeanum were recorded on Anabar Plateau in southern Taimyr (Fedosov et al, 2011).…”

“…At the same time, in Yakutia moss diversity substantially increases in areas where limestone, dolomite and schist rocks are common. Thus, in Ust-Maya District 253 species were revealed (Ignatov et al, 2001), while the list of mosses of Khangalassky District, in the middle course of Lena River with limestone cliffs along its banks, comprises 232 species (Ivanova et al, 2017).…”

New Asian localities of Hymenostylium xerophilum and H. gracillimum

“…Indusiella was thought for a long time to be extremely rare in Russia, but recent exploration focused on its findings revealed ca. 10 localities in Yakutia (Ivanova et al, 2016(Ivanova et al, , 2017Ignatova et al, 2018). The locality of Tortella densa is one of only two localities known so far in Yakutia, the second being ca.…”