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

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.00975
s.n.
Sphaerotheca humuli (DC.) Burrill

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056013
J.P. Tracy #13442 18 July 1934
Sphaerotheca humuli (DC.) Burrill
United States, California, Humboldt, Grouse Mountain

University of Georgia, Julian H. Miller Mycological Herbarium
Catalog #: GAM00008908
Joseph P. Tracy s.n. 18 July 1934
Sphaerotheca humuli (DC.) Burrill
USA, California, Humboldt, Grouse Mountain

Louisiana State University, Bernard Lowy Mycological Herbarium
Catalog #: LSU00153911
Joseph P. Tracy #13442 18 July 1934
Sphaerotheca humuli (DC.) Burr.
United States, California, Humboldt, Grouse Mountain.