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

Brown University - Algae
Catalog #: ABRU00004853
F. S. Collins s.n. 02 September 1913
Phormidium retzii (C.Agardh) Kützing ex Gomont
Bermuda, North Shore, Bermuda

Michigan State University Algae
Catalog #: MSC0184023
F.S. Collins #s.n. 02 September 1913
Phormidium retzii (C.Agardh) Kützing ex Gomont
Bermuda, North Shore

Miami University - Algae
Catalog #: 000210091
F.S. Collins #s.n.
Phormidium retzii (C.Agardh) Kützing ex Gomont
Bermuda, North Shore

Yale University Herbarium
Catalog #: YU.095322
Frank Shipley Collins s.n. 02 September 1913
Phormidium retzii (C.Agardh) Kützing ex Gomont
Bermuda, North Shore, Bermuda