A.B. Seymour and F.S. Earle [1-550, plus extras]
University of Michigan Herbarium
A. B. Seymour #s. n. 08 June 1886
Peronospora calotheca de Bary
USA, Wisconsin, Dane, Madison.
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USDA United States National Fungus Collections
Seymour, A. B. s.n. 08 June 1886
Peronospora calotheca de Bary
United States, Wisconsin, Dane, Madison
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