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

University of Michigan
Catalog #: 736721
F.S. Collins #s.n. 13 August 1910
Spirogyra porticalis var. tenuispira
United States, Massachusetts, Middlesex, Lower Pond, Wakefield