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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00294
s.n.
Sphaerotheca humuli (DC.) Burrill

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP11511
C. V. Piper s.n. 00 July 1891
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, vicinity of Eureka

Michigan State University Herbarium
Catalog #: MSC0212936
H. E. Parks s.n. 09 August 1924
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Vicinity of Eureka

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00081166
H. E. Parks s.n. 09 August 1924
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Vicinity of Eureka

Field Museum of Natural History
Catalog #: C0286348F
H.E. Parks #s.n. 09 August 1924
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Vicinity of Eureka

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056015
H.E. Parks #s.n. 09 August 1924
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Eureka;

Iowa State University, Ada Hayden Herbarium
Catalog #: ISC-F-0118858
H.E. Parks #s.n. 09 August 1924
Sphaerotheca aphanis (Wallr.) U. Braun
USA, California, Humboldt, Vicinity of Eureka