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

Brown University - Algae
Catalog #: ABRU00005086
C. Bullard s.n. 09 June 1917
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Hardwick Quarry, Quincy, MA

Yale University Herbarium
Catalog #: YU.095553
Charles Bullard s.n. 09 June 1917
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Quincy; Hardwick Quarry, Quincy, MA

University Herbarium, University of California, Berkeley
Catalog #: UC1826041
Charles Bullard #s.n. 09 June 1917
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Norfolk, Hardwick Quarry, Quincy

University of Michigan
Catalog #: 736195
Charles Bullard #s.n. 09 June 1917
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Norfolk, Hardwick Quarry, Quincy

University of Michigan
Catalog #: 736198
Charles Bullard #s.n. 09 June 1917
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Norfolk, Hardwick Quarry, Quincy

Michigan State University Algae
Catalog #: MSC0182238
Charles Bullard #s.n. 09 June 1917
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Norfolk, Hardwick Quarry, Quincy

Miami University - Algae
Catalog #: 000210305
Charles Bullard #s.n.
Cosmarium subcrenatum Hantzsch
United States, Massachusetts, Norfolk, Hardwick Quarry, Quincy