Charles Gardner Shaw Mycological Herbarium, Washington State University
F. Petrak s.n. 00 May 1923
Peronospora niessleana Berl.
, Werd-Berkiden: Becwa - uber bis Rozman (Carpathian mountains?)
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USDA United States National Fungus Collections
Petrak F. s.n. 00 August 1922
Septoria populi Desm.
Czechoslovakia, West Beskids, Lower Becva Bank, near Roznov
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