Petrak, Fl. Bohem. Morav. Exs. PilzeF. Petrak [1-2575]
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USDA United States National Fungus Collections
Catalog #: BPI 563424
Eichler G. A. s.n. 00 July 1900
Erysiphe horridula (Wallr.) Rabenh.
Czechoslovakia, Teplitz-Schoenau, Bohemia
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