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

Brown University - Algae
Catalog #: ABRU00003243
F. S. Collins s.n. 09 June 1889
Plectonema calothrichoides Gomont
United States, Massachusetts, Nahant, MA

Michigan State University Algae
Catalog #: MSC0183227
F.S. Collins #s.n. 12 January 1889
Leptolyngbya calothrichoides (Gomont) Anagnostidis & Komárek
United States, Massachusetts, Essex, Marblehead

Yale University Herbarium
Catalog #: YU.106536
Frank Shipley Collins s.n. 09 June 1889
Plectonema calothrichoides Gomont
United States, Massachusetts, Essex, Nahant; Nahant, MA