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

Brown University - Algae
Catalog #: ABRU00004540
E. N. Transeau s.n. 22 April 1911
Spirogyra inconstans Collins
United States, Illinois, Casey, IL

University of Michigan
Catalog #: 736651
E.N. Transeau #s.n. 22 August 1911
Spirogyra inconstans Collins
United States, Illinois, Coles, Casey

University of Michigan
Catalog #: 736652
E.N. Transeau #s.n. 22 August 1911
Spirogyra inconstans Collins
United States, Illinois, Coles, Casey

Michigan State University Algae
Catalog #: MSC0184765
E.N. Transeau #s.n. 22 April 1911
Spirogyra inconstans Collins
United States, Illinois, Clark, Casey

Miami University - Algae
Catalog #: 000189143
E.N. Transeau #s.n. 22 April 1911
Spirogyra inconstans Collins
United States, Illinois, Clark, Casey

Yale University Herbarium
Catalog #: YU.095011
Edgar Nelson Transeau s.n. 22 April 1911
Spirogyra inconstans Collins
United States, Illinois, Casey; Casey, IL