600 



CLADOPHORACEAE. 



Filaments 10-28 u in diameter ; cell walls mostly 



1-4 //, thick. 

 In or near salt water ; cells mostly 1-2 times as 



long as broad ; chromatophore usually rather 



solid and uniform. 

 In fresh water ; cells mostly 15 times as long 



as broad ; chromatophore usually lacunose or 



resolved into discs, plates, or bands of protean 



forms. 



3. R. riparium implexum. 



4. R. hieroglyphicum. 



1. Bhizoclonium Hookeri Kiitz. Sp. Alg. 383. 1849. 



High-littoral to low-water mark, often in Rhizophora association : Bermuda 

 and Florida to South America. Type from Kerguelen Island. 



The West Indian plants currently referred to this species appear to be coarser, 

 longer-celled, and thicker-walled than the Kerguelen Island type. 



2. Bhizoclonium crassipellitum robustum G. S. West, Jour. Bot. 42: 283. 1904. 



In fresh or brackish water, often in association with Rhizophora. New Provi- 

 dence, South Bimini, Exuma Chain, Cat Island, and Mariguana : Barbados. Type 

 of variety from Barbados. 



The filaments of the Bahamian specimens have a diameter of 39^90 #. Ap- 

 parently distinct from the plants here referred to R. Hookeri. 



3. Rhizoclonium riparium implexum (Dillw.) Eosenv. Medd. om Grb'nland 3: 



915. /. 34. 1893. 

 Conferva implexa Dillw. Brit. onf. 46. pi. B. 1809. 



In association with Rhizophora^ often clothing its roots. Berry Islands and 

 Bimini (det. F. S. Collins) : widely distributed. Type from Ireland. 



4. Bhizoclonium hieroglyphicum (Ag.) Kiitz. Phyc. Germ. 206. 1845. 



Conferva TiieroglypUca Ag. Flora 10: 636. 1827. 



In fresh-water pools. New Providence (Brace) : widely distributed. Type 

 from Carlsbad, Austria. 



3. *CLADOPHOBA Kiitz. Linnaea 17: 91. 1843. 



Plants of fresh or brackish wa'ter, unattached, usually floating ; filaments much bent 

 and curved ; main filaments 6O-120 # in diameter, the ramuli 

 20-40 u; cells 3-6 times as long as broad. 1. C. fracta. 



Marine. 



Ultimate ramuli nearly as stout as the main filaments. 



Filaments 35-9'5 ^ in diameter ; plants spongiose-cespi- 

 tose or spongiose-funicular ; cells mostly 8-10 times as 

 long as broad. 2. C. crispula. 



Filaments 150-320 # in diameter, plants cespitose, rather 

 rigid, dark green or blackish green, blackening after 

 collection, known only in association with a filament- 

 ous fungus endophytic in its cell walls. 3. C. fuUginosa. 

 Ultimate ramuli much more slender than the main filaments. 

 Plants bright green or light green. 



Ultimate ramuli more or less fascicled, 50-120 p. in 



diameter, constricted at septa. 4. C. fascicularis. 



Ultimate ramuli not fascicled, 16-40 //, in diameter. 



Virgate in habit. 5. C. nitida. 



Dichotomous or trichotomous, not virgate. 6. C. crystallina. 



Plants yellowish ; cells 4-10 times as long as broad, often 

 somewhat enlarged at distal end ; diameter of main 

 filaments 60-80 /A, the often secund ultimate ramuli 

 18-50 fr 7. C. luteola. 



1. Cladophora fracta (Vahl) Kiitz. Linnaea 17: 91. 1843. 

 Conferva fracta Vahl, Fl. Dan. 6 16 : 7. pi. 946. 1787. 

 ? Conferva vaga~bunda L. Sp. PI. 1167. 1753. 



Floating on brackish ponds, New Providence and Berry Islands : widely dis- 

 tributed. Type from Denmark. 



* The treatment of the recognized Bahamian species is based chiefly upon deter- 

 minations by Mr. F. S. Collins. 



