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

Brown University - Algae
Catalog #: ABRU00002913
I. Holden s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, Woodmont, CT

Field Museum of Natural History
Catalog #: C0519871F
I. Holden #s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, New Haven, Woodmont

Yale University Herbarium
Catalog #: YU.106482
Isaac Holden s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, Woodmont, CT

University of Michigan
Catalog #: 638528
Isaac Holden #s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, Woodmont

University of Michigan
Catalog #: 638534
Isaac Holden #s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, Woodmont

Michigan State University Algae
Catalog #: MSC0184422
Isaac Holden #s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, New Haven, Woodmont

Miami University - Algae
Catalog #: 000210389
Isaac Holden #s.n. 03 November 1896
Ralfsia verrucosa (Areschoug) ??Areschoug
United States, Connecticut, Woodmont