Novel records of Charophyta species for the south of West Siberia from Kolyvanskoe Lake

Nitella hyalina and Coleochaete nitellarum were found for the first time in the Siberia. Nitella wahlbergiana, a new species record for Altai Territory, was spotted in one of the southernmost localities of the species distribution range. All species were growing together with Chara braunii, C. virgata and Nitella syncarpa, rare species in Siberia. This association of rare species allowed recognition of Kolyvanskoe Lake as one of important plant areas for charophytes in North Asia.