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The examination of a moss sample collected from a lake in a remote mountainous region of Eastern Siberia revealed a diverse diatom flora that included four new species: Eunotia frigida, Brachysira subtile, Encyonopsis vasilievae, and Neidium rugosum. N. rugosum has been previously illustrated from several locations in the arctic and subarctic and is widely distributed across the circumpolar Arctic. The distribution of three other species is likely more limited. Besides these species, a number of rare diatoms were also found in the moss community. These include Neidium boyeri and Stauroneis crassula previously known only from North America; Encyonema sibericum so far only reported from Western Siberia, Encyonema lunatum var. borealis earlier found in Finland, and Eunotia ferefalcata, Pinnularia angustarea, and Naviculadicta mongolica so far reported only from Mongolia. This study contributes to the understanding of biogeographic patterns of diatom distribution.

This article presents an annotated list of plant type specimens stored in the Herbarium of the IBPC SB RAS (SASY), which is one of the largest in northeast Russia. The Herbarium fund is represented by five departments (vascular plants, mosses, lichens, aphylophore fungi, and algae), where about 95000 herbarium samples are stored exluding algae tests. The Herbarium has a collection of plants from Western and Eastern Siberia, the Far East, and some central regions of Russia. The exchange fund contains more than 3000 species of plants. Typical samples stored in Herbaria are of a particular value. In total, 14 species and 2 subspecies of liverworts, mosses, and vascular plants from 11 families were isolated from the main collection of the SASY Herbarium, which are represented by 14 types, 16 isotypes, 14 paratypes, and 5 epitypes (Frullania ignatovii Sofronova, Mamontov et Potemkin, Barbula jacutica Ignatova, Grimmia jacutica Ignatova, Bednarek-Ochyra, Afonina, J. Muñoz, Aconogonon amgense (V. Mich. et V. Perf.) Tzvel., Androsace gorodkovii Ovcz. et Karav., Anoplocaryum elenae Volot., Artemisia karavajevii Leonova, Astragalus zhiganicus L. Kuzn., and Castilleja galaсtionovae E.G. Nikolin, Castilleja rubra (Drob.) Rebr. var. multicaulis E.G. Nikolin, Castilleja tenella Rebr., Oxytropis scheludjakovae Karav. et Jurtzev, Rosa acicularis Lindl. subsp. melanocarpa L. Kuzn., Sorbocotoneaster pozdnjakovii Pojark. var. cotoneaster L. Kuzn. et Volot., S. pozdnjakovii Pojark. var. sorbus L. Kuzn. et Volot., Salix x zhataica Efimova, Shurduk & Ahti). Plants, the types of which are stored in SASY, represent the indigenous flora of Yakutia and are found quite rarely in this territory; eight of these species are listed in the Red Book of the Republic of Sakha (Yakutia), and 11 species are endemic. For each sample, a quote of the original label is indicated, and a brief ecology, distribution, and rarity category is given. The originality of the publication of each standard sample is indicated by the images of digitized herbarium sheets and their labels.

Аннотация. Изучение и охрана биологического разнообразия являются одними изактуальных проблем в современном мире. Жителями Вилюйского улуса и местной инспекцией государственного экологического надзора предложено придать статус памятника природы озеру Кумах, являющемуся местом гнездования, пролета многих птиц (лебедей, гусей, уток и т. д.),богатому запасами рыбы (карася). Озеро Кумах (65°07' с. ш., 119°43' в. д.) находится в Центральноякутской равнине, в бассейне среднего течения реки Тюнг (левый приток реки Вилюй). Растительность озера ранее подробно не рассматривалась. Целью наших исследований является оценка современного состояния растительности окрестностей озера для выявления ееособенностей, рационального использования и охраны; основная задача – выявление разнообразия основных растительных сообществ, его видового состава, структуры и редких видов растений. Изучение флоры и растительности окрестностей озера Кумах проведено в июле 2017 г. на основе маршрутных исследований по общепринятым методам флористических и геоботанических исследований. Выявлено, что леса вокруг озера ранее неоднократно подвергались воздействию пожаров разной интенсивности. Восстановление лиственницы на участках, где был полностью уничтожен древостой, идет медленно. Вокруг озера имеются довольно широкие полосытравянистых и кустарниковых ассоциаций со скудным видовым составом флоры, но все же являющихся хорошими стациями для гнездования многих видов водно-болотных птиц. В воде и мелководье в изобилии произрастают водные и прибрежно-водные растения, являющиесякормовой базой многих птиц, а также травоядных животных. Редких видов растений натерритории не выявлено. Уникальностью озера в ботаническом отношении является наличие соснового леса, находящегося на северном пределе ареала сосны обыкновенной. Несомненно, этот маленький участок леса нуждается в охране и наблюдении. В целом озеру Кумах предлагается рекомендовать придание статуса памятника природы местного или республиканского значения. Institute for Biological Problems of Cryolithozone SB RAS, Yakutsk, RussiaAbstract. The study and protection of biological diversity is one of the actual problems in the modern world. Residents and State Environmental Inspection of the Vilujsky district proposed to place the nesting place, flight of many birds (swans, geese, ducks, etc.) and fish-rich Kumakh Lake in status of Natural Monuments. The Kumakh Lake (65°07' N, 119°43 'E) is located in Central Yakut flatland, in the middle basin of Tyung River (left confluent of Vilyui River). The vegetation of the lake was not consideredin detail. The research objective: diagnosis of the lake condition to identify its features, rational use and protection; the main task is to identify the diversity of the main plant communities, its speciescomposition, structure and rare species. The study of the flora and vegetation of Kumakh Lake wascarried out on the basis of route studies using generally accepted floristic and geobotanical methodsin July 2017. It has been revealed that forests around the lake have been exposed to fires repeatedlyand with different strengths of impact. Larch restoration is slow where trees have been completelydestroyed. Around the lake there are quite wide bands of grassy and shrubby associations with a small number of species. But they create good nesting conditions for many wetland birds. Aquatic and coastal aquatic plants grow in abundance in water and shallow water, which are the food base of manymigratory and settled birds, as well as herbivores. Rare species were not identified in the study area. The uniqueness of the lake in the botanical sense is the presence of a pine forest, located on the northern limit of area. Undoubtedly, this small patch of pine needs to be protected and monitored due to global climatechanges on earth. In general, the Kumakh Lake can be recommended the status of "Natural Monument" of local, or even republican significance.