Scr. Rhodosperme^. Fa'ti. Lanrenciacea. 



Plate CLXXXII. 



LAURENCIA BOTRYOIDES, Gain 



Gen. Char. Frond cylindrical or plano-corapressed^ linear, pinnately 

 branched, cartilaginous, the apices obtuse, composed of two strata 

 of cells ; the inner of oblong, angular cells, shorter toward the cir- 

 cumference; the outer of small, roundish-angular cellules. Fruit: 



1, ovate, sessile ceramidia, containing a tuft of pear-shaped spores; 



2, tripartite tetraspores, imbedded, without order, beneath the tips of 

 the ramuli. — Laurencia [Lamour.), in honour of M. de La Laurencie, 

 a French naturalist. 



Fro7is teretiuscula v. plano-compressa, linearis, pinnato-ramosa, cartilaginea, api- 

 cibiis obtusis, ex stralis duobiis contexta ; strata medullari ex cellidis oblomjis 

 extns sensim brevioritjus, corticali ex cellidis minoribus rotundo-angulatls co- 

 loratis. Fnict. : 1, ceramidia ovata, sessilia, intra pericarpium crassiuscnlum 

 fascicidum sporarum pyriformimn foventia ; 2, tetrasporce triawjule divisce, 

 infra apicem raviulorum sine ordine hnmersce. 



Laurencia hotryoides .- dull-purple ; frond subcompressed, distichously 

 decompound-pinnate, with a fiexuous excurrent rachis ; pinnse alter- 

 nate, patent, once or twice compound; pinnules conical, obtuse, densely 

 tuberculated (like grape-clusters), the warts globose ; sporiferous ra- 

 muli similar, bearing tetraspores in the warts ; conceptacles ....?; 

 male receptacles saucer-shaped, terminal, full of flocci, bearing anthe- 

 ridia. 



L. botryoides ; purpurascens ; frotide compressiuscula disticlie decomposito-pin- 

 nata, racliidefiexnosa excurrente ; pinnis alternis pateniibus plus minus decom- 

 positis ; pinmdis conoideis obtusis dense botryoideo-tuberculatis, tidercidis fjlo- 

 bosis ; sporiferis conformibus tetrasporas in tuberculis circumcirca nidulantes 

 (jerentihus ; ceramidiis .... ?; receptaculis masculis terminalibus discoideis 

 apertisfda anther idiif era gererdibus, 



Laurencia botryoides, Gaill. Res. p. 15. Sand, in PI. Preiss. v. 2. p. 179. 

 Marv. Alg. Tasni. n. 31 ; Ner. Austr. p. 82 ; Fl. Tasm. v. %. p. 307. /. 

 Jg. Sp. Alg. V. 2. p. 759. Harv. Alg. Austr. Exsic. n. 239. 



Chondria botryoides, Alg. Sp. p. 346; Syst. p. 204. 



Eucus botryoides, Turn. Hist. t. 178. 

 Hab. Shores of Kent Islands, E. Brown. Tasmania, Gnnn. Port Fairy, 



Victoria, abundantly, JF. H. H. AVestern Australia ?, Preiss. 

 Geogu. Distr. Southern (and western?) shores of Australia. Tasmania. 



Descr. Root discoid, or slightly branched. Frond 8-12 inches high or more, 

 1-1 1 line in diameter, the older parts terete, the younger more or less 



