CLADOPHOEACEAE. 599 



Family 5. CHROOLEPIDACEAE. 



1. TRENTEPOHLIA :Mart. Fl. Crypt. Erlang. 351. 1S17. 



Amphiconium Nees, Syst. Pilz. 69. 1817. 



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



Filaments cylindric or subcylindric. 1, t. aurca 



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 Trovidence, 

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



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



1889. 



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



Trentepohlia iorulosa De Wild. Bull. Soc. Roy. Bot. Belg. 27=: 181. 1888. 



On and with small crustaceous lichens, especially on bark of Annotia 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. 



Aploxema Hass. Brit. Fresliw. 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. C. clavata. 

 Filaments free, less than 400 jj, in diameter. 



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



Filaments mostly 80-180 fj. in diameter. 3. C. hrachygona. 



1. Chaetomorpha clavata (Ag.) KUtz. 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^^: 7. pi 771. f. 2. 1778. 



In a RMzophora swamp. Rose Island : — widely distributed, especially in the 

 North Temperate Zone. Type from Denmark. 



3. Chaetomorpha brachygona Harv. Ncr. Bor.-Am. 3: 87, /)/. 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. RHIZOCLONIUM Kiitz. Linnaea 17: 90. 1843. 



Filaments 39-110 nt in diameter: cell-walls mostly 

 10-26 fx thick, usually laminated. 

 Cells 2-4 times as long as broad. 1. R. TTnokeri. 



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



