Ser. Ehodosperme^. Fam. Ceramiacece. 



Plate CXL. 



CROUANIA VESTITA, Harv. 



Gen. Chae. Frond nodoso- articulate, alternately decompound, consisting 

 of an articulate, monosiphonous, primary filament (or axis) emitting 

 at the nodes densely whorled, minute, dichotomo-fastigiate, free, arti- 

 culated ramelli. Fructification : \, solitary subterminaiyawi?/^, sur- 

 rounded by ramelli ; 2, external triangularly parted tetraspores, borne 

 on the ramelli. — Crouania (/. Ag.), in honour of the brothers Crouan, 

 of Brest, celebrated among French Phycologists. 



Frons nodoso-articulata, alterne decomposita, e filo frimar'io (axi) monospJionio 

 articulato ramellos minutissimos dichotomo-fastigiatos artictdatos verticillatos 

 ex nodis emittente constituta. Fruct.: \,favella subterm'males, solUarice, 

 inter ramellos abscondltce ; 2, tetrasporce triangule aid transversim divisce, ad 

 ramellos lateraliter affixce. 



Crov A'NIA iJcstita ; frond ultra-setaceous, decompoundly much branched, 

 scarcely gelatinous; branches and branchlets patent or divaricate, 

 attenuated, all densely or continuously clothed with whorled ramelli ; 

 ramelli divaricately multifid ; favellse solitary, at the ends of short 

 branchlets, surrounded by ramelli ; tetraspores spherical, triangularly 

 divided. 



C. vestita ; fronde uUrasetacea decomposite ramosissima vix gelatinosa; ramis 

 ramulisque patentibus diva?'icatisve attenuatis, omnibus rameUis densissime 

 velatis teretibus vix nodulosis, ramellis divaricato-midtifidis ; favellis solita- 

 riis in ramuUs minoribus inter ramellos immersis, tetrasporis spk(ericis trian- 

 gule divisis. 



Crouania vestita, Harv. in Trans. R. I. Acad. v. 22. p. 558; Alg. Austr. 

 Fxsic. n. 486. 



Hab. On Zostera, and the smaller Algae. Rottnest Island and King 



George^s Sound, W. II. H. Fremantle, George Clifton. 

 Geogr. Distr. Western Australia. 



Dbscr. Fronds solitary or tufted, 1-3 inches long, from half a line to nearly a 

 line in diameter, excessively branched in an in'egularly pinnate order, 3-4 

 times pinnate ; the branches and ramuli very unequal, long and short inter- 

 mixed, all very patent or subhorizontal, cylindrical, tapering to the apex. 

 The whole frond throughout is sub-equably clothed with densely set whorled 

 ramuli, so closely imbricating on each other that, except iu the lower part 

 of the frond, the nodose arrangement is scarcely obvious. Ramelli many 

 times dichotomous, short-jointed, with patent or divaricate ramifications. 

 Favellce subglobose, with a wide, gelatinous pericarp, raany-spored, hidden 



