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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00569
s.n.
Sphaerotheca humuli (DC.) Burrill

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP39806
J.P. Tracy s.n. 06 August 1933
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, near Coyote Peak, Bald Hills, east of Orick

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056029
J.P. Tracy #s.n. 00 August 1933
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Orick; Near Coyote, Bald Hills, east of Orick

University of Cincinnati, Margaret H. Fulford Herbarium
Catalog #: CINC-F-0000901
Tracy, J.P. #12959 06 August 1933
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, near Coyote Peak, Bald Hills, east of Orick