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

Brown University - Algae
Catalog #: ABRU00005121
F. S. Collins s.n. 13 August 1910
Spirogyra porticalis var. tenuispira
United States, Massachusetts, Lower Pond, Wakefield, MA

Yale University Herbarium
Catalog #: YU.094731
Frank Shipley Collins s.n. 13 August 1910
Spirogyra porticalis (O.F.Müller) Dumortier
United States, Massachusetts, Lower Pond, Wakefield, MA