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

Brown University - Algae
Catalog #: ABRU00004754
C. Bullard s.n. 12 September 1912
Closterium pritchardianum W.Archer
United States, New Hampshire, Grafton, Bethlehem; Bethlehem Junction, NH

Yale University Herbarium
Catalog #: YU.095222
Charles Bullard s.n. 12 June 1908
Closterium Ralfsii var. hybridum Rabenhorst
United States, Massachusetts, Middlesex, Medford; Brooks' Estate, West Medford, MA

University Herbarium, University of California, Berkeley
Catalog #: UC1823545
Charles Bullard #s.n. 12 September 1912
Closterium ralfsii Brébisson ex Ralfs
United States, New Hampshire, Grafton, Bethlehem Junction

University of Michigan
Catalog #: 736039
Charles Bullard #s.n. 12 September 1912
Closterium ralfsii var. hybridum Rabenhorst
United States, New Hampshire, Grafton, Bethlehem Junction

University of Michigan
Catalog #: 736042
Charles Bullard #s.n. 12 September 1912
Closterium ralfsii Brébisson ex Ralfs
United States, New Hampshire, Grafton, Bethlehem Junction

Michigan State University Algae
Catalog #: MSC0182063
Charles Bullard #s.n. 12 September 1912
Closterium ralfsii var. hybridum Rabenhorst
United States, New Hampshire, Grafton, Bethlehem Junction

Miami University - Algae
Catalog #: 000196601
Charles Bullard #s.n. 12 September 1912
Closterium ralfsii var. hybridum Rabenhorst
United States, New Hampshire, Grafton, Bethlehem Junction