Charles Gardner Shaw Mycological Herbarium, Washington State University
F. Petrak s.n. 00 June 1923
Peronospora radii de Bary
Czech Republic, Werd-Berkiden; Wagromder be Wsetin
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USDA United States National Fungus Collections
Petrak, F. s.n. 00 June 1923
Peronospora radii de Bary
Czechoslovakia, West Beskids, Vsetin
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