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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00974
s.n.
Sphaerotheca

USDA United States National Fungus Collections
Catalog #: BPI 948684
s.n.
Sphaerotheca humuli (DC.) Burrill
United States, California

Field Museum of Natural History
Catalog #: C0286338F
9f842812-5bc1-4b33-9647-c096ca3b9a4d
J. P. Tracy #13183 28 April 1934
Sphaerotheca humuli (DC.) Burrill (DC.) Burrill
U.S.A., California, Humboldt, Garberville; Garberville

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056027
J.P. Tracy #13183 28 April 1934
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Garberville;

University of Georgia, Julian H. Miller Mycological Herbarium
Catalog #: GAM00008903
Joseph P. Tracy s.n. 28 April 1934
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Garberville;