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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00887
s.n.
Erysiphe polygoni DC.

USDA United States National Fungus Collections
Catalog #: BPI 948597
s.n.
Erysiphe polygoni DC.
United States, California

Field Museum of Natural History
Catalog #: C0285452F
16253384-f62a-47ea-87b5-1b7025a63be9
J. P. Tracy #13040 30 August 1933
Erysiphe polygoni DC. DC.
U.S.A., California, Humboldt, Grouse Mountain

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0015696
J.P. Tracy #13040 30 August 1933
Erysiphe polygoni DC.
United States, California, Humboldt, Grouse Mountain

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP40802
Joseph P. Tracy s.n. 30 August 1933
Erysiphe polygoni DC.
United States, California, Humboldt, Grouse Mountain

Louisiana State University, Bernard Lowy Mycological Herbarium
Catalog #: LSU00155885
Joseph P. Tracy #13040 30 August 1933
Erysiphe polygoni DC.
United States, California, Humboldt, Grouse Mountain.

Michigan State University Herbarium
Catalog #: MSC0218950
Joseph P. Tracy #13040 30 August 1933
Erysiphe polygoni DC.
United States, California, Humboldt, Grouse Mountain;