Petrak, Fl. Bohem. Morav. Exs. PilzeF. Petrak [1-2575]
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USDA United States National Fungus Collections
Catalog #: BPI 564267
Eichler G. A. s.n. 00 August 1901
Erysiphe polygoni DC.
Czechoslovakia, Bohemia, Teplitz-Schoenau
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