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

Brown University - Algae
Catalog #: ABRU00003975
F. S. Collins s.n. 11 June 1905
Phormidium retzii var. fasciculatum
United States, Massachusetts, Walden Pond, Lynnfield, MA

Michigan State University Algae
Catalog #: MSC0184018
F.S. Collins #s.n. 11 June 1905
Phormidium retzii var. fasciculatum
United States, Massachusetts, Essex, Walden Pond, Lynnfield

Miami University - Algae
Catalog #: 000188250
F.S. Collins #s.n. 11 June 1905
Phormidium retzii var. fasciculatum
United States, Massachusetts, Essex, Walden Pond, Lynnfield

Yale University Herbarium
Catalog #: YU.094280
Frank Shipley Collins s.n. 11 June 1905
Phormidium retzii (C.Agardh) Kützing ex Gomont
United States, Massachusetts, Walden Pond, Lynnfield, MA