Tilden, Amer. Algae
Tilden, J.E. [1-650]

Michigan State University Algae
Catalog #: MSC0184775
David Griffiths #s.n. 00 June 1898
Spirogyra longata var. reversa
United States, South Dakota, Brown, Aberdeen

Miami University - Algae
Catalog #: 000185068
David Griffiths #s.n. 00 June 1898
Spirogyra longata var. reversa
United States, South Dakota, Brown, Aberdeen

Butler University
Catalog #: 504956
Josephine E. Tilden #s.n. 20 August 1901
Protococcus viridis C.Agardh
United States, Minnesota, Dalles of the St. Louis river, Fond du Lac, near Duluth