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

Brown University - Algae
Catalog #: ABRU00003234
Mrs. W. C. Simmons s.n.
Polysiphonia nigrescens var. affinis (Moore) Harvey
United States, Rhode Island, Newport, RI

Yale University Herbarium
Catalog #: YU.106534
Mrs. W. C. Simmons s.n. 00 May 1898
Polysiphonia nigrescens var. affinis (Moore) Harvey
United States, Rhode Island, Newport, Newport; Newport, RI