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

Brown University - Algae
Catalog #: ABRU00003379
I. Holden s.n.
Cladophora gracilis (Griffiths) Kützing
United States, Connecticut, Bridgeport, CT

Field Museum of Natural History
Catalog #: C0530083F
I. Holden #s.n. 00 July 1891
Cladophora gracilis (Griffiths) Kützing
United States, Connecticut, Fairfield, Bridgeport

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00204886
07b0eb7e-e6b1-41a3-9b45-39dbf0fa8a72
I. Holden #s.n. 00 July 1891
Cladophora gracilis (Griffiths) K
United States, Connecticut, Fairfield, Bridgeport

Yale University Herbarium
Catalog #: YU.091807
Isaac Holden s.n. 00 July 1891
Cladophora gracilis (Griffiths) Kützing
United States, Connecticut, Fairfield, Bridgeport; Bridgeport, CT

University of Michigan
Catalog #: 684100
Isaac Holden #s.n. 00 July 1891
Cladophora gracilis (Griffiths) Kützing
United States, Connecticut, Bridgeport

University of Michigan
Catalog #: 684670
Isaac Holden #s.n. 00 July 1891
Cladophora flexuosa (O.F.Müller) Kützing
United States, Connecticut, Fairfield, Bridgeport

Michigan State University Algae
Catalog #: MSC0181947
Isaac Holden #s.n. 00 July 1891
Cladophora flexuosa (O.F.Müller) Kützing
United States, Connecticut, Fairfield, Bridgeport

Miami University - Algae
Catalog #: 000187327
Isaac Holden #s.n. 00 July 1891
Cladophora gracilis (Griffiths) Kützing
United States, Connecticut, Bridgeport