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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00973
s.n.
Sphaerotheca

Field Museum of Natural History
Catalog #: C0286333F
J.P. Tracy #13454 18 July 1934
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Grouse Mountain

University of Georgia, Julian H. Miller Mycological Herbarium
Catalog #: GAM00008891
Joseph P. Tracy s.n. 18 July 1934
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, In wet meadow Grouse Mountain

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP40804
Joseph P. Tracy s.n. 18 July 1934
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Grouse Mountain

Louisiana State University, Bernard Lowy Mycological Herbarium
Catalog #: LSU00153896
Joseph P. Tracy #13454 18 July 1934
Sphaerotheca humuli (DC.) Burr.
United States, California, Humboldt, Grouse Mountain.

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056028
Joseph P. Tracy #13454 18 July 1934
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Grouse Mountain

Michigan State University Herbarium
Catalog #: MSC0218998
Joseph P. Tracy #13454 18 July 1934
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, In wet Meadow, Grouse Mountain