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

Brown University - Algae
Catalog #: ABRU00003716
W. J. V. Osterhout s.n. 02 June 1902
Ulothrix variabilis Kützing
United States, California, Farallone Islands, CA

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00212343
20a98a2d-5617-432b-ba7e-dee3e0a03acf
W. J. V. Osterhout #s.n. 02 June 1902
Ulothrix variabilis K
United States, California, San Francisco, Farallon Islands; 37.749365 -123.073267

University of Michigan
Catalog #: 733018
W.J.V. Osterhout #s.n. 02 June 1902
Ulothrix variabilis Kützing
United States, California, San Francisco, Farallon Islands

University of Michigan
Catalog #: 733025
W.J.V. Osterhout #s.n. 02 June 1902
Ulothrix variabilis Kützing
United States, California, San Francisco, Farallon Islands

Michigan State University Algae
Catalog #: MSC0185111
W.J.V. Osterhout #s.n. 02 June 1902
Ulothrix tenerrima (Kützing) Kützing
United States, California, San Francisco, Farallon Islands

Miami University - Algae
Catalog #: 000187999
W.J.V. Osterhout #s.n. 02 June 1902
Ulothrix variabilis Kützing
United States, California, San Francisco, Farallon Islands

Yale University Herbarium
Catalog #: YU.092105
Winthrop John Vanleuven Osterhout s.n. 02 June 1902
Ulothrix variabilis Kützing
United States, California, Farallone Islands, CA