First data on Micrasterias in West Siberia (Russia)

The aim of this work is to summarize the results of many years of research and to identify Micrasterias species new to Western Siberia. The publication is a continuation of a series of articles on the composition of individual groups of freshwater algae in the northern latitudes of Western Siberia. The results of a study of freshwater algae of the genus Micrasterias from 25 wetlands of the Ob-Irtysh basin, from 2005 to 2019, are presented. Algae were selected as a result of field route and stationary studies, using standard methods adopted in algology. The assessment of temperature, transparency, activity of the hydrogen index and electrical conductivity of surface waters was carried out with special devices. When identifying species, taxonomic updates were taken into account. Using light microscopy, 8 species, varieties and forms of the genus Micrasterias were found on the original material, 2 of which are recorded for the region for the first time ( Micrasterias pinnatifida Ralfs and M. radiosa Ralfs). The species list of the genus Micrasterias for water bodies of Western Siberia has been supplemented.