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

Brown University - Algae
Catalog #: ABRU00003862
N. L. Gardner s.n. 25 June 1899
Ptilota pectinata (Gunnerus) Kjellman
United States, Washington, San Juan Island, WA

Field Museum of Natural History
Catalog #: C0512931F
N. L. Gardner #218 25 June 1899
Ptilota tenuis Kylin
United States, Washington, San Juan, San Juan Island

Field Museum of Natural History
Catalog #: C0512933F
N. L. Gardner #s.n. 25 June 1899
Ptilota tenuis Kylin
United States, Washington, San Juan, San Juan Island, Washington

Rutgers University, Chrysler Herbarium - Macroalgae Collection
Catalog #: CHRB0017263
N.L. Gardner #1148 25 June 1899
Ptilota serrata Kützing
United States, Washington, San Juan, San Juan Island

University of Michigan
Catalog #: 670261
N.L. Gardner #s.n. 25 June 1899
Ptilota pectinata (Gunnerus) Kjellman
United States, Washington, San Juan, San Juan Island

University of Michigan
Catalog #: 1229166
N.L. Gardner #s.n. 25 June 1899
Ptilota pectinata f. tenuis Collins, 1903
United States, Washington, San Juan, San Juan Island

Michigan State University Algae
Catalog #: MSC0184371
N.L. Gardner #s.n. 25 June 1899
Ptilota filicina J.Agardh
United States, Washington, San Juan, San Juan Island

Miami University - Algae
Catalog #: 000188142
N.L. Gardner #s.n. 25 June 1899
Ptilota filicina J.Agardh
United States, Washington, San Juan, San Juan Island

Yale University Herbarium
Catalog #: YU.092231
Nathaniel Lyon Gardner s.n. 25 June 1899
Ptilota pectinata (Gunnerus) Kjellman
United States, Washington, San Juan Island, WA