Collins, Holden & Setchell, Phycoth. Bor.-Amer.
Collins, F.S.; Holden, I.; Setchell, W.A. [1-2300]

Brown University - Algae
Catalog #: ABRU00004091
N. L. Gardner s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Botanical Laboratory of the University of California, Berkeley, CA

University of Michigan
Catalog #: 736096
N.L. Gardner #s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Alameda, Botanical Laboratory, University of California, Berkeley

University of Michigan
Catalog #: 736097
N.L. Gardner #s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Alameda, Botanical Laboratory, University of California, Berkeley

Michigan State University Algae
Catalog #: MSC0182205
N.L. Gardner #s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Alameda, Botanical Laboratory, University of California, Berkeley

Miami University - Algae
Catalog #: 000188431
N.L. Gardner #s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Alameda, Botanical Laboratory, University of California, Berkeley

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00142661
68a173a3-5220-47df-9dd6-3d30beb6824f
N.L. Gardner #s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Alameda, Botanical Laboratory, University of California, Berkeley

Yale University Herbarium
Catalog #: YU.094399
Nathaniel Lyon Gardner s.n. 06 May 1906
Cosmarium crenatum Ralfs ex Ralfs
United States, California, Berkeley; Botanical Laboratory, University of California, Berkeley, CA