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

Brown University - Algae
Catalog #: ABRU00004973
F. S. Collins s.n.
Siphonocladus rigidus M.A.Howe
Bermuda, Agar's Island, Bermuda

Field Museum of Natural History
Catalog #: C0528355F
F.S. Collins #s.n. 00 December 1915
Siphonocladus rigidus M.A.Howe
Bermuda, Agar's Island

University of Michigan
Catalog #: 732008
F.S. Collins #s.n. 00 December 1915
Siphonocladus rigidus M.A.Howe
Bermuda, Agar's Island

Michigan State University Algae
Catalog #: MSC0184703
F.S. Collins #s.n. 00 December 1915
Siphonocladus rigidus M.A.Howe
Bermuda, Agar's Island

Miami University - Algae
Catalog #: 000210203
F.S. Collins #s.n. 00 December 1915
Siphonocladus rigidus M.A.Howe
Bermuda, Agar's Island

Yale University Herbarium
Catalog #: YU.095439
Frank Shipley Collins s.n.
Siphonocladus rigidus M.A.Howe
Bermuda, Agar's Island, Bermuda