Species composition of desmid algae and their habitat preferences in water bodies of Ekaterinburg city were studied during the 2013–2017. Thirty-seven species and subspecific taxa which belong to 12 genera and 2 families were identified, of which 17 species are new for the eastern macroslope of the Middle Urals. Canonical correspondence analysis, which was performed to reveal habitat preferences, demonstrates that the majority of analyzed species prefer quarry lakes, ponds and overgrown lake shores, contrary to fens and rivers.

The article provides an annotated list, which contains 35 species and subspecific taxa of desmid algae collected in 2015 in swamps near Yugorsk city, West Siberia. Twelve species (Closterium costatum, Cosmarium regnesi, Euastrum ansatum, E. gayanum, E. pulchellum, Staurastrum aculeatum, S. arcuatum var. subavicula, S. tohopekaligense, Staurodesmus dickiei var. circularis, S. glaber, Xanthidium cristatum, X. uncinatum) and one variety (Closterium closterioides var. intermedium) are new for the Khanty-Mansi Autonomous Okrug. Data on morphology and distribution of the species are provided.