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

Brown University - Algae
Catalog #: ABRU00003067
H. M. Richards s.n.
Nostoc sphaeroides Kützing ex Bornet & Flahault
United States, Massachusetts, Fresh Pond, Cambridge, MA

Michigan State University Algae
Catalog #: MSC0183732
H.M. Richards #s.n.
Nostoc sphaeroides Kützing ex Bornet & Flahault
United States, Massachusetts, Middlesex, Fresh Pond, Cambridge

Miami University - Algae
Catalog #: 000186393
H.M. Richards #s.n.
Nostoc sphaeroides Kützing ex Bornet & Flahault
United States, Massachusetts, Middlesex, Fresh Pond, Cambridge

Yale University Herbarium
Catalog #: YU.091536
Herbert Maule Richards s.n.
Nostoc sphaeroides Kützing ex Bornet & Flahault
United States, Massachusetts, Middlesex, Cambridge; Fresh Pond, Cambridge, MA