J.B. Ellis, B.M. Everhart, and E. Bartholomew [1501-5100, plus extras]

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00061052
W. C. Blasdale s.n. 00 May 1893
Oidium erysipheoides
United States, California, Marion, Ross Valley

University of California Berkeley, University Herbarium
Catalog #: UC44922
W. C. Blasdale s.n. 00 May 1893
Oidium erysiphoides Fr.
USA, California, Marin, Ross Valley

Miami University, Willard Sherman Turrell Herbarium
Catalog #: 000280123
W. C. Blasdale #157 00 May 1893
Oidium erysiphoides Fr.
United States, California, Marion

Clemson University Herbarium
Catalog #: CLEMS-F0001691
W. C. Blasdale #2457 00 May 1893
Oidium erysiphoides Fr.
United States, California, Marion, Ross Valley; 37.948813 -122.544977

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0025762
W. C. Blasdale #s.n. 00 May 1898
Oidium erysiphoides Fr.
United States, California, Marin, Ross Valley

Michigan State University Herbarium non-lichenized fungi
Catalog #: MSC0219255
W.C. Blasdale s.n. 00 May 1893
Oidium erysipheoides
United States, California, Marion, Ross Valley;

Academy of Natural Sciences of Drexel University
Catalog #: PH00323436
W.C. Blasdale #s.n 00 May 1893
Oidium erysipheoides Fr.
United States, California, Marion, Ross Valley; 37.948813 -122.544977

Brown University Herbarium
Catalog #: CBRU00001342
WC Blasdale s.n. 00 May 1893
Oidium erysipheoides
United States, California, Marion, Ross Valley;

Purdue University, Kriebel Herbarium
Catalog #: PUL00018552
WC Blasdale s.n. 00 May 1893
Oidium erysipheoides
United States, California, Marion, Ross Valley;