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

Brown University - Algae
Catalog #: ABRU00004215
M. A. Howe s.n.
Penicillus capitatus Lamarck
Bahamas, Bahamas

Field Museum of Natural History
Catalog #: C0532803F
Marshall A. Howe s.n. 18 December 1907
Penicillus capitatus Lamarck
Turks and Caicos Islands, British West Indies: Fort George Cay

Yale University Herbarium
Catalog #: YU.094522
Marshall A. Howe s.n.
Penicillus capitatus Lamarck
Bahamas, Bahamas

University of Michigan
Catalog #: 730737
Marshall A. Howe #s.n.
Penicillus capitatus Lamarck
Bahamas, [No precise loc]

University of Michigan
Catalog #: 730919
Marshall A. Howe #s.n.
Penicillus capitatus Lamarck
Bahamas, [No precise loc]

Michigan State University Algae
Catalog #: MSC0183955
Marshall A. Howe #s.n. 18 December 1907
Penicillus capitatus Lamarck
Turks and Caicos Islands, Fort George Cay, Caicos Islands

Miami University - Algae
Catalog #: 000188550
Marshall A. Howe #s.n.
Penicillus capitatus Lamarck
Turks and Caicos Islands, Fort George Cay, Caicos Islands

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00205485
f75bd908-af64-40e8-9ea0-83a6e427f7ee
Marshall A. Howe #s.n. 18 December 1907
Penicillus capitatus Lamarck
Turks and Caicos Islands, Caicos Islands, Fort George Cay