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

Brown University - Algae
Catalog #: ABRU00004090
N. L. Gardner s.n. 05 March 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Berkeley, CA

University Herbarium, University of California, Berkeley
Catalog #: UC274137
N. L. Gardner #1650 00 March 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, East of Berkeley

University of Michigan
Catalog #: 735952
N.L. Gardner #s.n. 05 May 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, Berkeley

University of Michigan
Catalog #: 735956
N.L. Gardner #s.n. 05 May 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, Berkeley

Michigan State University Algae
Catalog #: MSC0182034
N.L. Gardner #s.n. 05 May 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, Berkeley

Miami University - Algae
Catalog #: 000188430
N.L. Gardner #s.n. 05 May 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, Berkeley

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00142582
48deccaf-5009-49f4-8395-314137e6653e
N.L. Gardner #s.n. 05 May 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, Berkeley

Yale University Herbarium
Catalog #: YU.094398
Nathaniel Lyon Gardner s.n. 05 March 1906
Closterium acerosum Ehrenberg ex Ralfs
United States, California, Alameda, Berkeley; Berkeley, CA