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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00830
s.n.
Sphaerotheca humuli (DC.) Burrill

Field Museum of Natural History
Catalog #: C0286335F
J.P. Tracy #18069 20 June 1948
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Trinity River, near Willow Creek

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056031
J.P. Tracy #18069 20 June 1948
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Willow Creek; Trinity River, near Willow Creek

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP39086
Joseph P. Tracy s.n. 20 June 1948
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Trinity River near Willow Creek

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP40013
Joseph P. Tracy s.n. 20 June 1948
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Trinity River near Willow Creek

Michigan State University Herbarium
Catalog #: MSC0218921
Joseph P. Tracy #18069 20 June 1948
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Trinity River, near Willow Creek