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

Brown University - Algae
Catalog #: ABRU00003257
I. Holden s.n. 28 August 1895
Ulothrix variabilis f. marina Wille
United States, Connecticut, Bridgeport, CT

Miami University - Algae
Catalog #: 000187158
I. Holden #s.n. 22 April 1893
Ulothrix variabilis Kützing
United States, Connecticut, Fairfield, Bridgeport

Yale University Herbarium
Catalog #: YU.091698
Isaac Holden s.n. 28 August 1895
Ulothrix variabilis Kützing
United States, Connecticut, Fairfield, Bridgeport; Bridgeport, CT

University of Michigan
Catalog #: 733022
Isaac Holden #s.n. 22 April 1893
Ulothrix variabilis f. marina Wille
United States, Connecticut, Fairfield, Bridgeport

University of Michigan
Catalog #: 733026
Isaac Holden #s.n. 22 April 1893
Ulothrix variabilis f. marina Wille
United States, Connecticut, Fairfield, Bridgeport

Michigan State University Algae
Catalog #: MSC0184897
Isaac Holden #s.n. 28 August 1895
Stichococcus marinus (Wille) Hazen
United States, Connecticut, Fairfield, Bridgeport

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00212338
23cc3dc9-41b3-4a5c-90f5-497f96ab0dbb
Isaac Holden #s.n. 28 August 1895
Ulothrix variabilis K
United States, Connecticut, Fairfield, Ash Creek, Bridgeport