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

Brown University - Algae
Catalog #: ABRU00004405
C. Bullard s.n. 28 April 1910
Closterium acerosum Ehrenberg ex Ralfs
United States, Massachusetts, near Hill's Crossing Station, MA

Yale University Herbarium
Catalog #: YU.094714
Charles Bullard s.n. 28 April 1910
Closterium acerosum Ehrenberg ex Ralfs
United States, Massachusetts, near Hill's Crossing Station, MA

University of Michigan
Catalog #: 735953
Charles Bullard #s.n. 28 April 1910
Closterium acerosum Ehrenberg ex Ralfs
United States, Massachusetts, Hill's Crossing Station

University of Michigan
Catalog #: 735957
Charles Bullard #s.n. 28 April 1910
Closterium acerosum Ehrenberg ex Ralfs
United States, Massachusetts, Hill's Crossing Station

Michigan State University Algae
Catalog #: MSC0182035
Charles Bullard #s.n. 28 April 1910
Closterium acerosum Ehrenberg ex Ralfs
United States, Massachusetts, Hill's Crossing Station

Miami University - Algae
Catalog #: 000189179
Charles Bullard #s.n. 28 April 1910
Closterium acerosum Ehrenberg ex Ralfs
United States, Massachusetts, Hill's Crossing Station