600 



CLADOPHORACEAP]. 



Filaments 10-28 p, in diameter; cell walls mostly 



14 fi 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 1-5 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. Rhizoclonium 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. Rhizoclonium 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 p. Ap- 

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



3. Rhizoclonium riparium implexum (Dillw.) Eosenv. Medd. om Gronland 3: 



915. /. 34. 1893. 

 Conferva implexa Dillw. Brit. Conf. 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. Rhizoclonium hieroglyphicum (Ag.) Kiitz. Phyc. Germ. 206. 1845. 



Conferva Meroglyphica Ag. Flora 10: 636. 1827. 



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

 from Carlsbad, Austria. 



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



Plants of fresh or brackish water, unattached, usually floating : filaments much bent 

 and curved : main filaments 60-120 p, in diameter, the ramuli 

 2040 p, ; cells 3-6 times as long as broad. 

 Marine. 



Ultimate ramuli nearly as stout as the main filaments. 



Filaments 35-95 p in diameter ; plants spongiose-cespi- 

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

 long as broad. 

 Filaments 150-320 p, 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. 

 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. 

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

 Virgate in habit. 



Dichotomous or trichotomous, not virgate. 

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

 somewhat enlarged at distal end ; diameter of main 

 filaments 60-80 p, the often secund ultimate ramuli 

 18-50 p.. 



1. C. fracta. 



2. C. crispula. 



3. C. fuliginosa. 



4. C. fascicularis. 



5. G. nitida. 



6. C. crystallina. 



7. C. luteola. 



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



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

 ? Conferva vagabunda 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. 



