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

Brown University - Algae
Catalog #: ABRU00003217
J. B. Davy s.n.
Porphyridium cruentum (S.F.Gray) Nägeli
United States, California, University of California, Berkeley, CA

Field Museum of Natural History
Catalog #: C0503899F
J. B. Davy #s.n. 00 April 1899
Porphyridium cruentum (S.F.Gray) Nägeli
United States, California, Alameda, University of California, Berkeley

Michigan State University Algae
Catalog #: MSC0184136
J.B. Davy #s.n.
Porphyridium purpureum (Bory de Saint-Vincent) K.M.Drew & R.Ross
United States, California, Alameda, University of California, Berkeley

Miami University - Algae
Catalog #: 000210413
J.B. Davy #s.n.
Porphyridium cruentum (S.F.Gray) Nägeli
United States, California, Alameda, University of California, Berkeley

Yale University Herbarium
Catalog #: YU.106529
Joseph Burtt Davy s.n.
Porphyridium cruentum (S.F.Gray) Nägeli
United States, California, University of California, Berkeley, CA