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

Charles Gardner Shaw Mycological Herbarium, Washington State University
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

USDA United States National Fungus Collections
Catalog #: BPI 604644
Tracy J. P. #12959 00 August 1933
Sphaerotheca humuli (DC.) Burrill
United States, California, Orick, Humboldt Co. near Coyote Peak, Bald Hills, E. of

USDA United States National Fungus Collections
Catalog #: BPI 948274
Tracy J. P. #12959 06 August 1933
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Near Coyote Peak, Bald Hills, east of Orick

University of Cincinnati, Margaret H. Fulford Herbarium - Fungi
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