CLADOPHOBACEAE. 599 



Family 5. CHROOLEPIDACEAE. 



1. TRENTEPOHLIA Mart. Fl. Crypt. Erlang. 351. 1817. 

 AMPHICONIUM Nees, Syst. Pilz. 69. 1817. 

 CHROOLEPUS Ag. Syst. Alg. xxi, 34. 1824. 



Filaments cylindric or subcylindric. 1. T. aurea. 



Filaments torulose, diameter of cells at middle about twice the 



diameter at septa ; occurring on or with crustaceous lichens. 2. T. rigidula. 



1. Trentepohlia aurea (L.) Mart. loc. cit. 



Byssus aurea L. Sp. PI. 1168'. 1753. 

 Chroolepus aureus Kiitz. Phyc. Gen. 284. 1843. 



On rocks, fences, trunks of trees, etc., probably common. New Providence, 

 Andros, Abaco, and Great Bahama : cosmopolitan. Type European. 



2. Trentepohlia rigidula (Mull. Arg.) Harlot, Jour, de Bot. 3: 403. /. 17. 



1889. 



Coenogonium rigidulum Miill. Arg. Flora 65: 490. 1882. 



Trentepohlia torulosa De Wild. Bull. Soc, Koy. Bot. Belg. 27 2 : 181. 1888. 



On and with small crustaceous lichens, especially on bark of Annona sp. New 

 Providence : widely distributed in the warmer parts of the earth. Type from 

 Australia. 



The cell walls of the Bahamian specimens are smooth or slightly roughened, 

 differing in that respect considerably from those of the Australian type, which are 

 strongly roughened. 



Family 6. CLADOPHORACEAE. 



1. CHAETOMORPHA Kiitz. Phyc. Germ. 203. My 1845, 

 APLONEMA Hass. Brit. Freshw. Alg. 213. Jl 1845. 



Filaments attached, 400-800 fi in diameter except at extreme base, commonly monill- 



form in upper part, with cells about as broad as long or broader. 1. O. clavata. 

 Filaments free, less than 400 # in diameter. 



Filaments mostly 200-250 /j. in diameter. 2. C. Linum. 



Filaments mostly 80-180 /j. in diameter. 3. C. brachygona. 



1. Chaetomorpha clavata (Ag.) Kiitz. Bot. Zeit. 5: 166. 1847. 



Conferva clavata Ag. Syst. Alg. 99. 1824. 

 ? Conferva intestinalis Ag. loc. cit. 



In a tide-pool, Hog Island (near Nassau) : Jamaica, American Virgin Islands, 

 and Barbados. Type from West Indies. 



2. Chaetomorpha Linum (O. F. Miill.) Kiitz. Phyc. Germ. 204. 1845. 



Conferva Linum O. F. Miill. Fl. Dan. 5 13 : 7. pi. 771. f. 2. 1778. 



In a Rhizophora swamp, Rose Island : widely distributed, especially in the 

 North Temperate Zone. Type from Denmark. 



3. Chaetomorpha brachygona Harv. Ner. Bor.-Am. 3: 87, pi. 46 A. 1858. 



In shallow water, especially in tidal ponds. New Providence, Exuma Chain, 

 Atwood Cay, and Caicos Islands : Bermuda, Florida, Porto Rico, American Virgin 

 Islands, and northern South America. Type from Key West, Florida. 



2. RHIZOCLONTUM Kiitz. Linnaea 17: 90. 1843. 



Filaments 39-110 # in diameter ; cell-walls mostly 



10-26 /JL thick, usually laminated. 



Cells 24 times as long as broad. 1. R. HooJceri. 



Cells 1-2 times as long as broad. 2. R. crassipellitum robustum. 



