Potamogeton praelongus Wulf.

Material examined.

RUSSIA, Tyumen Reg. - Yurginsky distr. • neighbourhood of Severo-Pletnyovo; 56.0445°N, 68.0960°E; northeastern shore of Lake Dubrovnoye, shallow water off the shore of lake; 17 Aug. 2008; I.V. Kuzmin leg.