Petrak, Mycoth. Carp.
Petrak, F. [1-475]
IndExs #641513049

USDA United States National Fungus Collections
Catalog #: BPI 564530
Petrak F. s.n. 00 September 1923
Erysiphe polygoni DC.
Czechoslovakia, West Beskids, on the Lower Bank of Becva, near Roznov