614 CODIACEAE. 



straight and parallel, mostly 60-100 # in diameter ; 

 branches of . eorticating filaments of stipe com- 

 pactly cymose-fastigiate, the ultimate divisions 

 scarcely longer than broad, truncate, truncate-ob- 

 tuse, or commonly with expanded truncate-capi- 

 tate apices. 3. U. cyathiformis. 

 Filaments of flabellum appendaged ; calcareous sheaths, if 

 differentiated, non-porose. 

 Filaments strongly constricted above dichotomies ; ap- 

 pendages crowned with 2-8 acuminate prongs or 

 spines. 4. U. spinulosa. 

 Filaments not constricted above dichotomies ; append- 

 ages simple or sparingly furcate, obtuse, truncate, 

 or capitate. 5. U. Wilsoni. 



1 Udotea Flabellum (Ell. & Soland.) M. A. Howe, Bull. Torrey Club 31: 94. 

 1904. 



Corallina Flabellum Ell. & Soland. Nat. Hist. Zooph. 124. pi. 24. f. A, B, 



C. 1786. 

 Flabellaria pavonia Lamarck, Ann. Mus. Hist. Nat. 20: 301. 1813. 

 Udotea flabellata Lamour. Hist. Polyp. 311. 1816. 

 Flabellaria incrustata Chauvin, Becherches 123. 1842. 

 Udotea Halimeda Kiitz. Sp. Alg. 503. 1849. 



Common on a sandy or muddy bottom, from near low-water mark down to 

 30-40 meters. New Providence, Berry Islands, Great Bahama, Garden Cay, Bimini. 

 Exuma Chain, Watling's Island, Mariguana, Caicos Islands, Great Ragged Island, 

 and Salt Cay: Bermuda and Florida to Guadeloupe and Panama (Colon). Type 

 from " West Indies." 



2. Udotea conglutinata (Ell. & Soland.) Lamour. Hist. Polyp. 312. 1816. 



Corallina conglutinata Ell. & Soland. Nat. Hist. Zooph. 125. pi. 25. f. 7. 



1786. 



Flabellaria conglutinata Lamarck, Ann. Mus. Hist. Nat. 20: 301. 1813. 



On a sandy bottom from near low-water mark down to 14 meters or more. 

 New Providence, Andros, Joulter's Cays, North Cat Cay, Bimini, Green Cay, Wat- 

 ling's Island, Mariguana, Caicos, and Castle Island : Bermuda and Florida to the 

 American Virgin Islands. Type from the Bahama Islands. 



3. Udotea cyathiformis Decaisne, Ann. Sci. Nat. Bot. II. 18: 106. 1842. 



Udotea conglutinata Vickers, Phyc. Barbad. 1: pi. 32. 1908. 



On a sandy bottom from near low-water mark down to 30 meters or more. 

 Berry Islands, Bimini, North Cat Cay, Exuma Chain, Caicos Islands, and Castle 

 Island: North Carolina to Barbados and Panama (Colon). Type from Isles des 

 Saintes, Guadeloupe. 



4. Udotea spinulosa M. A. Howe, Bull. Torrey Club 36: 97. pi. 4. f. 2; pi. 8. 



f. 1-7. 1909. 



On a sandy bottom near low-water mark. Bimini (type) : American Virgin 

 Islands (in 3040 meters, fide Borgesen). 



5. Udotea Wilsoni Gepp & Howe, Siboga Exped. Monog. 62: 130. pi. 7. f. 66; 



pi. 8. f. 67, 68. 1911. 

 On a sandy bottom in shallow water. Anguilla Isles (type) : Florida and Cuba. 



7. HA1IMEDA Lamour. Nouv. Bull. Sci. Soc. Philom. 3: 186 (as 



Halimedea*). 1812. 



Opuntia Nacc. Fl. Ven. 6: 104. 1828. Not Opuntia L. 

 Sertolara (Imp.) Nardo, Isis 1834: 673. 1834. 

 Botryophora Bompard, Hedwigia 6: 129. 1867. 



Segments reniform, semiorbicular, or deltoid-obovate, margins entire or (in H. 

 Opuntia) crenate or sometimes lobed. Nodal filaments of central strand fusing 

 more or less completely in pairs or in threes. 



* Afterwards (1816) changed by Lamouroux himself to Halimeda. 



