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

Brown University - Algae
Catalog #: ABRU00003858
N. L. Gardner s.n.
Pterosiphonia bipinnata (Postels & Ruprecht) Falkenberg
United States, Washington, San Juan Island, WA

Rutgers University, Chrysler Herbarium - Macroalgae Collection
Catalog #: CHRB0017242
N.L. Gardner #1145b
Polyostea bipinnata (Postels & Ruprecht) Ruprecht
United States, Washington, San Juan, San Juan Island

University of Michigan
Catalog #: 669928
N.L. Gardner #s.n.
Polyostea bipinnata (Postels & Ruprecht) Ruprecht
United States, Washington, San Juan, San Juan Island

University of Michigan
Catalog #: 669939
N.L. Gardner #s.n.
Polyostea bipinnata (Postels & Ruprecht) Ruprecht
United States, Washington, San Juan, San Juan Island

Michigan State University Algae
Catalog #: MSC0184233
N.L. Gardner #s.n.
Pterosiphonia bipinnata (Postels & Ruprecht) Falkenberg
United States, Washington, San Juan, San Juan Islands

Miami University - Algae
Catalog #: 000188138
N.L. Gardner #s.n. 22 August 2015
Pterosiphonia bipinnata (Postels & Ruprecht) Falkenberg
United States, Washington, San Juan, San Juan Islands

Yale University Herbarium
Catalog #: YU.106608
Nathaniel Lyon Gardner s.n.
Pterosiphonia bipinnata (Postels & Ruprecht) Falkenberg
United States, Washington, San Juan Island, WA