Anonymous, Calif. Fungi
Herbarium of the University of California. [1- ? 1425]

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00888
s.n.
Erysiphe polygoni DC.

USDA United States National Fungus Collections
Catalog #: BPI 948598
s.n.
Erysiphe polygoni DC.
United States, California

Field Museum of Natural History
Catalog #: C0285453F
d31c8f7e-ad31-4e9f-bdeb-87a1720dc413
J. P. Tracy #8886 26 July 1930
Erysiphe polygoni DC. DC.
U.S.A., California, Humboldt, Eureka

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0015683
J.P. Tracy #8886 26 July 1930
Erysiphe polygoni DC.
United States, California, Humboldt, Eureka;

Louisiana State University, Bernard Lowy Mycological Herbarium
Catalog #: LSU00155887
Joseph P. Tracy #8886 26 July 1930
Erysiphe polygoni DC.
United States, California, Humboldt, Eureka.