Petrak, Crypt. Exs.
F. Petrak [3201- 4700]

USDA United States National Fungus Collections
Catalog #: BPI 1042342
s.n.
Erysiphe graminis DC.
Germany

USDA United States National Fungus Collections
Catalog #: BPI 1042398
s.n.
Erysiphe graminis DC.
Germany

University of California Berkeley, University Herbarium
Catalog #: UC728153
K. Keissler s.n.
Blumeria graminis (DC.) Speer
Austria, Niederösterreich, Mödling, Modling