Potamogeton friesii Rupr.

Material examined.

RUSSIA, Tyumen Reg. - Yarkovo distr. • Lake Petigul'; 57.3903°N, 67.4678°E; shallow coastal water; 19 Jun. 2019; V.I. Kapitonov leg. - Tobolsk distr. • 450 m S of Bajgara; 58.0236°N, 68.8440°E; lake in the floodplain of the right coast of Irtysh River, shallow coastal water; 3 Jul. 2019 . • 9.5 km E of Tobolsk; E of the “Tobolsk-Polymer” site; 58.2200°N, 68.4718°E; channel along the railway, in front of the dam, shallow water; 19 Jul. 2019 .