Petrak, Fl. Bohem. Morav. Exs. Pilze
F. Petrak [1-2575]

USDA United States National Fungus Collections
Catalog #: BPI 564767
Eichler G. A. s.n. 00 August 1905
Erysiphe polygoni DC.
Czechoslovakia, Teplitz, Schoenau, Bohemia