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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00297
s.n.
Sphaerotheca humuli (DC.) Burrill

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00081165
J. P. Tracy s.n. 15 September 1930
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Road to Kneeland Blad Hills

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056035
J. P. Tracy #s.n. 15 September 1930
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Road to Kneeland Bald Hills

Michigan State University Herbarium
Catalog #: MSC0212938
J. P. Tracy; H. E. Parks s.n. 15 September 1930
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Road to Kneeland Bald Hills

Washington State University, Charles Gardner Shaw Mycological Herbarium
Catalog #: WSP11512
J.P Tracy; H.E. Parks s.n. 15 September 1930
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, road to Kneeland Bald Hills

Field Museum of Natural History
Catalog #: C0286346F
J.P. Tracy #s.n. 15 September 1930
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Road to Kneeland Bald Hills

Iowa State University, Ada Hayden Herbarium
Catalog #: ISC-F-0118870
J.P. Tracy #s.n. 15 September 1930
Sphaerotheca collomiae U. Braun
USA, California, Humboldt, Road to Kneeland Bald Hills

University of Georgia, Julian H. Miller Mycological Herbarium
Catalog #: GAM00008882
Joseph P. Tracy s.n. 15 September 1930
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Road to Kneeland Bald Hills