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

Brown University - Algae
Catalog #: ABRU00003753
W. J. V. Osterhout s.n.
Phormidium incrustatum (Nägeli) Gomont ex Gomont
United States, California, Berkeley, CA

Michigan State University Algae
Catalog #: MSC0184053
W.J.V. Osterhout #s.n. 00 September 1902
Phormidium incrustatum (Nägeli) Gomont ex Gomont
United States, California, Alameda, Berkeley

Miami University - Algae
Catalog #: 000188035
W.J.V. Osterhout #s.n. 00 September 1902
Phormidium incrustatum (Nägeli) Gomont ex Gomont
United States, California, Alameda, Berkeley

Yale University Herbarium
Catalog #: YU.092140
Winthrop John Vanleuven Osterhout s.n.
Phormidium incrustatum (Nägeli) Gomont ex Gomont
United States, California, Alameda, Berkeley; Berkeley, CA