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

Brown University - Algae
Catalog #: ABRU00004906
N. L. Gardner s.n.
Penium curtum (Brébisson ex Ralfs) Kützing
United States, California, near Santa Fe Railroad station, Oakland, CA

University of Michigan
Catalog #: 736401
N.L. Gardner #s.n. 00 January 1914
Penium curtum f. majus Wille
United States, California, Alameda, Near Santa Fe railroad station, Oakland

Miami University - Algae
Catalog #: 000210142
N.L. Gardner #s.n. 00 January 1914
Penium curtum f. majus Wille
United States, California, Alameda, Pool of water near Santa Fe R.R. station, Oakland

Yale University Herbarium
Catalog #: YU.095375
Nathaniel Lyon Gardner s.n.
Penium curtum (Brébisson ex Ralfs) Kützing
United States, California, Oakland; near Santa Fe Railroad station, Oakland, CA