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

Brown University - Algae
Catalog #: ABRU00003742
M. A. Howe s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Key West, FL

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00218191
72c1e54c-8a5d-4f20-922d-1704038fd752
M. A. Howe #s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West

Yale University Herbarium
Catalog #: YU.092129
Marshall A. Howe s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West; Key West

University of Michigan
Catalog #: 658044
Marshall A. Howe #s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West

University of Michigan
Catalog #: 658048
Marshall A. Howe #s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West

Field Museum of Natural History
Catalog #: C0511561F
Marshall A. Howe #s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West

Michigan State University Algae
Catalog #: MSC0183014
Marshall A. Howe #s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West

Miami University - Algae
Catalog #: 000188024
Marshall A. Howe #s.n. 01 November 1902
Herposiphonia secunda (C.Agardh) Ambronn
United States, Florida, Monroe, Key West