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

Brown University - Algae
Catalog #: ABRU00003982
N. L. Gardner s.n. 05 May 1904
Cosmarium quadrum var. minus Nordstedt
United States, California, San Francisco, CA

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00142679
bb3ca2bd-794e-4529-87db-ec28713443a7
N. L. Gardner #s.n. 05 May 1904
Cosmarium quadrum P.Lundell
United States, California, San Francisco, CA

University of Michigan
Catalog #: 736181
N.L. Gardner #s.n. 05 May 1904
Cosmarium quadrum var. minus Nordstedt
United States, California, San Francisco, San Francisco

University of Michigan
Catalog #: 736182
N.L. Gardner #s.n. 05 May 1904
Cosmarium quadrum var. minus Nordstedt
United States, California, San Francisco, San Francisco

Michigan State University Algae
Catalog #: MSC0182230
N.L. Gardner #s.n. 05 May 1904
Cosmarium quadrum var. minus Nordstedt
United States, California, San Francisco, San Francisco

Miami University - Algae
Catalog #: 000188257
N.L. Gardner #s.n. 05 May 1904
Cosmarium quadrum var. minus Nordstedt
United States, California, San Francisco, San Francisco

Yale University Herbarium
Catalog #: YU.094287
Nathaniel Lyon Gardner s.n. 05 May 1904
Cosmarium quadrum var. minus Nordstedt
United States, California, San Francisco, CA