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

Brown University - Algae
Catalog #: ABRU00005025
E. N. Transeau s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Tile Factory Pond, Charleston, IL

University Herbarium, University of California, Berkeley
Catalog #: UC2040635
E. N. Transeau #s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston.

University of Michigan
Catalog #: 736662
E.N. Transeau #s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston

Michigan State University Algae
Catalog #: MSC0184771
E.N. Transeau #s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston

Miami University - Algae
Catalog #: 000210254
E.N. Transeau #s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston

Yale University Herbarium
Catalog #: YU.095497
Edgar Nelson Transeau s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Charleston; Tile Factory Pond, Charleston, IL

University of North Carolina at Chapel Hill Herbarium; Max & Fran Hommersand Algae Herbarium: Algae
Catalog #: NCU-A-0028526
Transeau, E. N. #s.n. 20 September 1912
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Charleston; Tile Factory Pond, Charleston