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

Brown University - Algae
Catalog #: ABRU00004078
N. L. Gardner s.n. 25 May 1906
Phormidium calidum (C.Agardh) Gomont
United States, California, Stow Lake, Golden Gate Park, San Francisco, CA

Michigan State University Algae
Catalog #: MSC0183490
N.L. Gardner #s.n. 25 May 1906
Microcoleus calidus (C.Agardh) Gomont
United States, California, San Francisco, Stow Lake, Golden Gate Park

Miami University - Algae
Catalog #: 000188421
N.L. Gardner #s.n.
Microcoleus calidus (Gomont ex Gomont) Strunecky, Komárek & J.R.Johansen, 2013
United States, California, San Francisco, Stow Lake, Golden Gate Park

Yale University Herbarium
Catalog #: YU.094386
Nathaniel Lyon Gardner s.n. 25 May 1906
Phormidium calidum (C.Agardh) Gomont
United States, California, San Francisco, San Francisco; Stow Lake, Golden Gate Park, San Francisco, CA