Tilden, Amer. AlgaeTilden, J.E. [1-650]
Michigan State University Algae
David Griffiths #s.n. 00 June 1898
Spirogyra longata var. reversa
United States, South Dakota, Brown, Aberdeen
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Miami University - Algae
David Griffiths #s.n. 00 June 1898
Spirogyra longata var. reversa
United States, South Dakota, Brown, Aberdeen
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Butler University
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
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