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

Brown University - Algae
Catalog #: ABRU00005085
C. Bullard s.n. 14 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Winter Pond, Winchester, MA

Yale University Herbarium
Catalog #: YU.095552
Charles Bullard s.n. 14 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Winchester; Winter Pond, Winchester, MA

University Herbarium, University of California, Berkeley
Catalog #: UC1826023
Charles Bullard #s.n. 04 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Middlesex, Winter Pond, Winchester

University Herbarium, University of California, Berkeley
Catalog #: UC1826024
Charles Bullard #s.n. 14 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Middlesex, Winter Pond, Winchester

University of Michigan
Catalog #: 736143
Charles Bullard #s.n. 14 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Middlesex, Winter Pond, Winchester

University of Michigan
Catalog #: 736145
Charles Bullard #s.n. 14 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Middlesex, Winter Pond, Winchester

Michigan State University Algae
Catalog #: MSC0182217
Charles Bullard #s.n. 14 June 1917
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Middlesex, Winter Pond, Winchester

Miami University - Algae
Catalog #: 000210304
Charles Bullard #s.n.
Cosmarium ovale Ralfs ex Ralfs
United States, Massachusetts, Middlesex, Winter Pond, Winchester