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

Brown University - Algae
Catalog #: ABRU00004102
N. L. Gardner s.n. 26 June 1906
Ulothrix variabilis Kützing
United States, California, University of California, Berkeley, CA

University of Michigan
Catalog #: 733019
N.L. Gardner #s.n. 26 June 1906
Ulothrix variabilis Kützing
United States, California, Alameda, University of California, Berkeley

University of Michigan
Catalog #: 733023
N.L. Gardner #s.n. 26 June 1906
Ulothrix variabilis Kützing
United States, California, Alameda, University of California, Berkeley

Michigan State University Algae
Catalog #: MSC0185109
N.L. Gardner #s.n. 26 June 1906
Ulothrix tenerrima (Kützing) Kützing
United States, California, Alameda, University of California, Berkeley

Miami University - Algae
Catalog #: 000188442
N.L. Gardner #s.n. 26 June 1906
Ulothrix tenerrima (Kützing) Kützing
United States, California, Alameda, University of California, Berkeley

Yale University Herbarium
Catalog #: YU.094410
Nathaniel Lyon Gardner s.n. 26 June 1906
Ulothrix variabilis Kützing
United States, California, University of California, Berkeley, CA