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

Brown University - Algae
Catalog #: ABRU00005024
E. N. Transeau s.n. 27 July 1908
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Tile Factory Pond, Charleston, IL

University Herbarium, University of California, Berkeley
Catalog #: UC1827965
E. N. Transeau #2223 27 July 1908
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston.

University of Michigan
Catalog #: 736661
E.N. Transeau #s.n. 27 July 1918
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston

Michigan State University Algae
Catalog #: MSC0184770
E.N. Transeau #s.n. 27 July 1908
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston

Miami University - Algae
Catalog #: 000210525
E.N. Transeau #s.n. 27 July 1908
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Tile Factory Pond, Charleston

Yale University Herbarium
Catalog #: YU.095496
Edgar Nelson Transeau s.n. 27 July 1908
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-0028527
Transeau, E. N. #s.n. 27 July 1908
Spirogyra irregularis Nägeli ex Kützing
United States, Illinois, Coles, Charleston; Tile Factory Pond, Charleston