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

Brown University - Algae
Catalog #: ABRU00003726
M. A. Howe s.n. 30 October 1902
Siphonocladus tropicus (P.L.Crouan & H.M.Crouan) J.Agardh
United States, Florida, Key West, FL

Field Museum of Natural History
Catalog #: C0528347F
M. A. Howe #s.n. 30 October 1902
Siphonocladus tropicus (P.L.Crouan & H.M.Crouan) J.Agardh
United States, Florida, Monroe, Key West

Miami University - Algae
Catalog #: 000188009
M.A. Howe #s.n. 30 October 1902
Siphonocladus tropicus (P.L.Crouan & H.M.Crouan) J.Agardh
United States, Florida, Monroe, Key West

Yale University Herbarium
Catalog #: YU.092114
Marshall A. Howe s.n. 30 October 1902
Siphonocladus tropicus (P.L.Crouan & H.M.Crouan) J.Agardh
United States, Florida, Monroe, Key West; Key West

University of Michigan
Catalog #: 732011
Marshall A. Howe #s.n. 30 October 1902
Siphonocladus rigidus M.A.Howe
United States, Florida, Monroe, Key West

University of Michigan
Catalog #: 732012
Marshall A. Howe #s.n. 30 October 1902
Siphonocladus rigidus M.A.Howe
United States, Florida, Monroe, Key West

Michigan State University Algae
Catalog #: MSC0184706
Marshall A. Howe #s.n. 30 October 1902
Siphonocladus tropicus (P.L.Crouan & H.M.Crouan) J.Agardh
United States, Florida, Monroe, Key West