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

Brown University - Algae
Catalog #: ABRU00003918
F. S. Collins s.n. 12 January 1899
Chroococcus varius A.Braun
United States, Massachusetts, Botanic Garden, Cambridge, MA

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00227785
5ea867d7-43ae-451e-9b96-696e33087376
F. S. Collins #s.n. 12 January 1909
Chroococcus N
United States, Massachusetts

Michigan State University Algae
Catalog #: MSC0181870
F.S. Collins #s.n. 12 January 1899
Chroococcus varius A.Braun
United States, Massachusetts, Middlesex, Botanic Garden, Cambridge

Miami University - Algae
Catalog #: 000188197
F.S. Collins #s.n. 12 January 1899
Chroococcus varius A.Braun
United States, Massachusetts, Middlesex, Botanic Garden, Cambridge

Yale University Herbarium
Catalog #: YU.094158
Frank Shipley Collins s.n. 12 January 1899
Chroococcus varius A.Braun
United States, Massachusetts, Middlesex, Cambridge; Botanic Garden, Cambridge, MA