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

Brown University - Algae
Catalog #: ABRU00002741
W. A. Setchell s.n.
Petrospongium berkeleyi (Greville) Nägeli
United States, California, San Pedro, CA

University of Michigan
Catalog #: 638057
W.A. Setchell #s.n. 00 December 1895
Petrospongium rugosum (Okamura) Setchell & N.L.Gardner
United States, California, Los Angeles, San Pedro

University of Michigan
Catalog #: 638058
W.A. Setchell #s.n. 00 December 1895
Petrospongium rugosum (Okamura) Setchell & N.L.Gardner
United States, California, Los Angeles, San Pedro

Field Museum of Natural History
Catalog #: C0520551F
W.A. Setchell #s.n. 00 December 1895
Petrospongium berkeleyi (Greville) Nägeli
United States, California, Los Angeles, San Pedro

Michigan State University Algae
Catalog #: MSC0183979
W.A. Setchell #s.n. 00 December 1895
Petrospongium rugosum (Okamura) Setchell & N.L.Gardner
United States, California, Los Angeles, San Pedro

Miami University - Algae
Catalog #: 000186636
W.A. Setchell #s.n. 00 December 1895
Petrospongium berkeleyi (Greville) Nägeli
United States, California, Los Angeles, San Pedro

Yale University Herbarium
Catalog #: YU.091312
William Albert Setchell s.n. 00 December 1895
Petrospongium berkeleyi (Greville) Nägeli
United States, California, San Pedro, CA