600 



CLADOPHOEACEAE. 



Filaments 10—28 ii in diameter ; cell walls mostly 



1-^ 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. B. hieroglyphicum. 



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



High-littoral to low-water mark, often in RMzopTiora 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. Ehizoclonium crassipellitum ro^bustum G. S. West, Jour. Bot. 42 : 283. 1904. 



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

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

 of variety from Barbados. 



The filaments of the Bahamian specimens have a diameter of 39—90 /i. Ap- 

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



3. Rhizoclonium riparium implexum (Dillw.) Rosenv. Medd. om Grijnland 3: 



915. /. 34. 1S93. 

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



In association with RJiizopJiora, 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 hieroglyphica Ag. Flora 10: 636. 1827. 



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

 from Carlsbad, Austria. 



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



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

 and curved ; main filaments 60-120 /i, in diameter, the ramuli 

 20— iO fi ; cells 3—6 times as long as broad. 

 Marine. 



Ultimate ramuli nearly as stout as the main filaments. 



Filaments 35—95 /j, in diameter ; plants spongiose-cespi- 

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

 long as broad. 

 Filaments 150^320 ii 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 a in 



diameter, constricted at septa. 

 Ultimate ramuli not fascicled, 16-40 /j 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 /j,, the often secund ultimate ramuli 

 18-50 Ii. 7. £7. luteola. 



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



Conferva fracta Vahl, PI. Dan. 6": 7. pi. 946. 1787. 

 ? Conferva vagabunda L. Sp. PI. 1167. 1753. 



Floating on brackish ponds, New Providence and Berry Islands : 

 tributed. Type from Denmark. 



1. O. fracta. 



2. C. crispula. 



3. G. fuliginosa. 



4. C. fascicularis. 



5. C. nitida. 



6. O. crystallina. 



-widely dis- 



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

 minations by Mr. F. S. Collins. 



