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

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00081120
A. A. Heller s.n. 08 July 1903
Sphaerotheca humuli (DC.) Burrill
United States, California, Nevada, Lower end of Donner Lake

Field Museum of Natural History
Catalog #: C0286370F
A.A. Heller #s.n. 08 July 1903
Sphaerotheca humuli (DC.) Burrill
USA, California, Nevada, Lower end of Donner Lake