Wittrock & Nordstedt, Algae Aquae Dulcis Exs.
Wittrock, V.B.; Nordstedt, C.F.O. [1 - 1200]

Field Museum of Natural History
Catalog #: C0500468F
V. Wittrock #s.n. 03 November 1878
Polycystis prasina
Sweden, Uppland (Upl), Lake Mälaren, Flottsund

Miami University - Algae
Catalog #: 000198017
V. Wittrock #s.n. 03 November 1878
Polycystis prasina Wittr.
Sweden, Uppland (Upl), Uplandiæ in lacu Mälaren ad Flottsund

University of Michigan
Catalog #: 1229185
Veit B. Wittrock #s.n. 03 November 1878
Polycystis prasina
Sweden, Uppland (Upl), Lake Mälaren, near Flottsund.