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

Brown University - Algae
Catalog #: ABRU00003017
I. Holden s.n. 07 November 1897
Ulva lactuca var. rigida (C.Agardh) Le Jolis
United States, Connecticut, Bridgeport, CT

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00213699
409cc752-cefb-41de-a49d-ad1c496f4760
I. Holden #s.n. 07 November 1897
Ulva rigida C.Agardh
United States, Connecticut, Bridgeport

Field Museum of Natural History
Catalog #: C0577209F
I. Holden #s.n. 07 November 1897
Ulva lactuca f. rigida De Toni
United States, Connecticut, Fairfield, Bridgeport

Yale University Herbarium
Catalog #: YU.091489
Isaac Holden s.n. 07 November 1897
Ulva lactuca var. rigida (C.Agardh) Le Jolis
United States, Connecticut, Fairfield, Bridgeport; Bridgeport, CT

University of Michigan
Catalog #: 735237
Isaac Holden #s.n. 07 November 1897
Ulva rigida C.Agardh
United States, Connecticut, Fairfield, Bridgeport

University of Michigan
Catalog #: 735241
Isaac Holden #s.n. 07 November 1897
Ulva rigida C.Agardh
United States, Connecticut, Fairfield, Bridgeport

Michigan State University Algae
Catalog #: MSC0185138
Isaac Holden #s.n. 07 November 1897
Ulva rigida C.Agardh
United States, Connecticut, Fairfield, Bridgeport

Miami University - Algae
Catalog #: 000186821
Isaac Holden #s.n. 07 November 1897
Ulva lactuca var. rigida (C.Agardh) Le Jolis
United States, Connecticut, Fairfield, Bridgeport