Petrak, Fl. Bohem. Morav. Exs. PilzeF. Petrak [1-2575]
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University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0075602
s.n.
Peronospora parasitica (Persoon) de Bary
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USDA United States National Fungus Collections
Catalog #: BPI 787253
Petrak, F. s.n. 02 May 1924
Peronospora brassicae Gäum.
Czechoslovakia, Mahr.-Weisskirchen garden
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