Newly recorded and rare Desmidiales (Charophyta: Conjugatophyceae) from the Middle Urals, Russia

New disributional data on 14 previously unrecorded or rare species and varieties of algae belonging to Closteriaceae, Desmidiaceae, Gonatozygaceae and Peniaceae (order Desmidiales) are presented for the Middle Urals. Closterium cornu Ehrenberg ex Ralfs, Closterium macilentum Brebisson, Closterium navicula (Brebisson) Lutkemuller, and Cosmarium crenulatum Nageli are newly recorded to the Urals. A brief description, including measurements of cells as well as regional and global distribution, is given for each taxon.