CHARACEAE. 617 



2. Codium isthmocladum Vickers, Ann. Sci. Nat. Bot. IX. 1: 57. 190.". 



In shallow water. Berry Islands : Bermuda and Florida to Barbados. Type 

 from Barbados. 



The only Bahamian specimen seen that seems referable to this species is 

 coarser, more rigid, and less nitent than the typical form, but conforms in the 

 characters of the peripheral utricles and sporangia. 



3. Codium intertextum Collins & Hervey, Proc. Am. Acad. 53: 54. 1917. 



Under shelving rocks and in crevices, closely adherent. Gun Cay and Atwood 

 Cay : Bermuda and Florida to Barbados. Type from Bermuda. 



3a. Codium intertextum cribrosum M. A. Howe, var. nov. 



Codium adhaerens M. A. Howe; Gardner, Univ. California Publ. Bot. 6: 

 492, 496. pi. 42. f. 9. 1919. Not C. adliaerens (Cabr.) Ag. 



Wall of the peripheral utricles (of the more exposed at least) slightly 

 thickened at the apex, the incrassate area mostly 5-13 ft thick and internally 

 cribrose-pitted, the walls elsewhere mostly 1-2 fi thick. 



On rocks and other algae, from above low-water mark down to a depth of at 

 least 12 meters. Little Harbor Cay, Berry Islands (Howe 3583-type) : Jamaica 

 and Porto Rico. 



It was at first thought that the peculiar pitting of the apical walls of the 

 utricles might be sufficient to warrant ranging this plant in the specific category, 

 but the occasional occurrence of similarly marked utricles in plants otherwise pre- 

 dominantly agreeing with C. intertextum (e. g., no. 3139 from Gun Cay) would 

 seem to make this impractical. 



Family 13. VAUCHERIACEAE. 



1. DICHOTOMOSIPHON Ernst, Beih. Bot. Centralbl. 13: 115. 1902. 



1. Dichotomosiphon pusillus Collins, Tufts College Stud. 2: 431. 1909. 



On and with Amphibia on roots of Rhizophora, in tide-pools and lagoons, and 

 often forming a compact dark-green velvety turf on rocks between the tide-lines 

 and on the mud in Rhizophora associations. New Providence, Exuma Chain, Wat- 

 ling's Island, and Great Ragged Island : Bermuda to Jamaica. Type from West 

 Indies (Jamaica). 



The filaments show a wide range in size, even in a single tuft, varying from 

 15 n to 60^ in diameter. 



Family 14. CHARACEAE. 



1. *CHAKA L. Sp. PI. 1156. 1753. 



Stems triply corticated, but, by imperfect development of some of the secondary 

 cells usually appearing doubly corticated; stipulodes forming a single whorl; at 

 least the basal leaf-internode uncorticated ; dioicous ; spine- 

 cells conspicuous on all stem-internodes. 



1. C. Horncmannii. 

 Stems usually very regularly triply corticated ; stipules form- 

 ing a double whorl ; monoicous. 

 Some or all leaflets well developed. 2. ft. foliolosa. 



All leaflets at sterile nodes greatly reduced. 3. C. haitensis. 



1. Chara Hornemannii Wallm. K. Vet.-Akad. Handl. 1852: 2SS. 1854. 



Chara ceratopliylla Halsted, Proc. Boston Soc. Nat. Hist. 20: 182. 1879. 

 Not C. ceratopliylla Wallr. 



In salt or brackish ponds. New Providence, Exuma Chain, and Watling's 

 Island : southern Florida and New Mexico through the West Indies and Mexico to 

 southern Brazil. Type from Crab Island (Vieques), Porto Rico. 



* Determinations chiefly by the late Dr. Charles Budd Robinson and the key 

 and svnonvmy .adapted from the paper published bv him in Bull. N, Y. Bot. Gar*** 

 4: 244-30S. 1906. 



40 



