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

Brown University - Algae
Catalog #: ABRU00003940
N. L. Gardner s.n. 31 January 1904
Conferva utriculosa Kützing
United States, California, San Francisco, CA

University of Michigan
Catalog #: 736974
N.L. Gardner #s.n. 31 January 1904
Tribonema utriculosum (Kützing) Hazen
United States, California, San Francisco, Railroad track, San Francisco

University of Michigan
Catalog #: 736979
N.L. Gardner #s.n. 31 January 1904
Tribonema bombycina (C.Agardh) Derbès & Solier
United States, California, San Francisco, Railroad track, San Francisco

Michigan State University Algae
Catalog #: MSC0182169
N.L. Gardner #s.n. 31 January 1904
Conferva utriculosa Kützing
United States, California, San Francisco, Railroad track, San Francisco

Miami University - Algae
Catalog #: 000210429
N.L. Gardner #s.n. 31 January 1904
Conferva utriculosa Kützing
United States, California, San Francisco, Railroad track, San Francisco

Yale University Herbarium
Catalog #: YU.094179
Nathaniel Lyon Gardner s.n. 31 January 1904
Conferva utriculosa Kützing
United States, California, San Francisco, CA