Abstract
Using the electron microscopy, 435 diatom algae from 78 genera of 14 different types of tundra water bodies located in the vicinity of the Ust-Lensky State Reserve, north of the Arctic Circle, on the northern exposure of the slope of the Primorsky Ridge (the eastern spur of the Kharaulakh Range of the Verkhoyansk Mountain system) 435 diatom algae from 78 genera were revealed. Among them, 24 taxa of the species rank and 1 of the generic rank are new to the flora of Russia. Most of the identified species, which are new to the flora of Russia, are found in Europe and are characteristic of oligotrophic water bodies and watercourses. Of all the species under study, 66 species belonging to 28 genera have been identified to the genus, with the largest number of them belonging to the genera Planothidium (7) and Gomphonema (10).
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