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

Brown University - Algae
Catalog #: ABRU00003380
F. S. Collins s.n. 01 July 1899
Cladophora gracilis (Griffiths) Kützing
United States, Maine, Hancock, Brooksville; Spectacle Island, Penobscot Bay, ME

Field Museum of Natural History
Catalog #: C0500204F
F.S. Collins #s.n. 01 July 1899
Cladophora gracilis f. elongata Collins
United States, Maine, Spectacle Island, Penobscot Bay

University of Michigan
Catalog #: 684099
F.S. Collins #s.n. 01 July 1899
Cladophora ruchingeri (C.Agardh) Kützing
United States, Maine, Spectacle Island, Penobscot Bay

University of Michigan
Catalog #: 684669
F.S. Collins #s.n. 01 July 1899
Cladophora flexuosa (O.F.Müller) Kützing
United States, Maine, Hancock, Spectacle Island, Penobscot Bay

Michigan State University Algae
Catalog #: MSC0181950
F.S. Collins #s.n. 01 July 1899
Cladophora flexuosa (O.F.Müller) Kützing
United States, Maine, Hancock, Spectacle Island, Penobscot Bay

Miami University - Algae
Catalog #: 000187328
F.S. Collins #s.n. 01 July 1899
Cladophora gracilis (Griffiths) Kützing
United States, Maine, Spectacle Island, Penobscot Bay

Yale University Herbarium
Catalog #: YU.091808
Frank Shipley Collins s.n. 01 July 1899
Cladophora gracilis (Griffiths) Kützing
United States, Maine, Hancock, Brooksville; Spectacle Island, Penobscot Bay, ME