Petrak, Crypt. Exs.F. Petrak [3201- 4700]
USDA United States National Fungus Collections
s.n.
Erysiphe graminis DC.
Germany
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USDA United States National Fungus Collections
s.n.
Erysiphe graminis DC.
Germany
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University of California Berkeley, University Herbarium
K. Keissler s.n.
Blumeria graminis (DC.) Speer
Austria, Niederösterreich, Mödling, Modling
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