Collins, Holden & Setchell, Phycoth. Bor.-Amer.Collins, F.S.; Holden, I.; Setchell, W.A. [1-2300]
Brown University - Algae
E. Butler s.n.
Pithophora varia Wille
United States, Minnesota, Minneapolis, MN
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Michigan State University Algae
E. Butler #s.n.
Pithophora roettleri (Roth) Wittrock
United States, Minnesota, Hennepin, Minneapolis
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Yale University Herbarium
Eloise Butler s.n.
Pithophora varia Wille
United States, Minnesota, Minneapolis, MN
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University of Michigan
Eloise Butler #s.n.
Pithophora varia Wille
United States, Minnesota, Hennepin, Minneapolis
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Miami University - Algae
Eloise Butler #s.n.
Pithophora varia Wille
United States, Minnesota, Hennepin, Minneapolis
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Field Museum of Natural History
N. Wille s.n.
Pithophora oedogonia (Montagne) Wittrock
United States, Minnesota, In quiet water, Minneapolis
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