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

Cornell University Plant Pathology Herbarium
Catalog #: CaliforniaF.00831
s.n.
Sphaerotheca humuli (DC.) Burrill

Field Museum of Natural History
Catalog #: C0286336F
e7f8b9d9-79ce-48a0-82e9-867057e3d36f
J. P. Tracy #17905 24 August 1947
Sphaerotheca humuli (DC.) Burrill (DC.) Burrill
U.S.A., California, Humboldt, Box Camp Meadow, on Trinity Summit

University of Michigan Herbarium
Catalog #: 309401
J. P. Tracy #17905 24 August 1947
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
USA, California, Humboldt, Trinity Summit, Box Camp.

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0056391
Joseph P. Tracy #17905 24 August 1947
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
United States, California, Humboldt, Trinity Summit, Box Camp

USDA United States National Fungus Collections
Catalog #: BPI 604541
Tracy Joseph P. #17905 24 August 1947
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
United States, California, Box Camp, Trinity Summit, Humboldt Co.

USDA United States National Fungus Collections
Catalog #: BPI 948541
Tracy, Joseph P. #17905 24 August 1947
Sphaerotheca humuli var. fuliginea (Schltdl.) E.S. Salmon
United States, California, Humboldt, Box Camp, Trinity Summit