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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00772
s.n.
Erysiphe polygoni DC.

USDA United States National Fungus Collections
Catalog #: BPI 948482
s.n.
Erysiphe polygoni DC.
United States, California

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0015687
J. P. Tracy #17638 25 August 1946
Erysiphe polygoni DC.
United States, California, Humboldt, Damp place by roadside, 3 miles south of Field's Landing

Field Museum of Natural History
Catalog #: C0285457F
bea0808a-34bd-4521-8ddf-239b49260164
J. P. Tracy #17638 25 August 1946
Erysiphe polygoni DC. DC.
U.S.A., California, Humboldt, 3 miles south of Field's Landing, by roadside

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP39065
Joseph P. Tracy s.n. 25 August 1946
Erysiphe polygoni DC.
United States, California, Humboldt, 3 miles south of Field's Landing

Michigan State University Herbarium
Catalog #: MSC0214097
Joseph P. Tracy #17638 25 August 1946
Erysiphe polygoni DC.
United States, California, Humboldt, 3 miles south of Field's Landing