Year: 2025, Number: 2, Pages: 5-22
New data have been obtained on the taxonomic composition of algae and cyanobacteria in the water bodies of the Olyokma Nature Reserve. In two surveyed oxbow lakes, 119 species and varieties of algae were identifi ed. Previously published data on the algal fl ora of the reserve were analyzed. Based on this, a consolidated taxonomic list of algae and cyanobacteria was compiled, comprising 418 taxa, 89 of which are new records for the reserve. In terms of species richness, representatives of the phylum Heterokontophyta predominate. They are followed, respectively, by the phyla Charophyta and Chlorophyta in terms of species diversity. Desmid algae are the most diverse at the levels of orders, families, and genera. Overall, the algal flora of the reserve is signifi cantly richer compared to the surrounding areas. The most promising directions for continuing algological research in the reserve have been identifi ed.