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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00337
s.n.
Sphaerotheca humuli (DC.) Burrill

Michigan State University Herbarium
Catalog #: MSC0212977
E. B. Copeland s.n. 29 June 1931
Sphaerotheca humili
United States, California, Butte, Near Jonesville

Field Museum of Natural History
Catalog #: C0286367F
E.B. Copeland #s.n. 29 June 1931
Sphaerotheca humuli (DC.) Burrill
USA, California, Butte, Jonesville; near Jonesville

Iowa State University, Ada Hayden Herbarium
Catalog #: ISC-F-0118871
E.B. Copeland #s.n. 29 June 1931
Sphaerotheca collomiae U. Braun
USA, California, Butte, Near Jonesville

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP35281
E.Bartholomew; E. B. Copeland s.n. 29 June 1931
Sphaerotheca humuli (DC.) Burrill
United States, California, Butte, near Jonesville