Ser. Ehodosperme^. Earn. Rhodomelace<B. 



Plate CXXVI. 



RHODOMELA TRIGENEA, iiarv. 



Gen. Char. Frond terete, dendroid^ inarticulate, solid, coated with minute 

 polygonal cellules; the axis articulated, polysiphonous. Fructifica- 

 tion : 1, ovate ceramidia containing a tuft of pear-shaped spores ; 2, 

 tetraspores lodged in swollen ramuli or in pod-like stichidia, in a sin- 

 gle or double row. — Ehodomela {Ag.), from poSeo'i, red, and fjueXwi, 

 hlach ; because these plants become darker in drying. 



Fro7is teres, dendroldea, htarticulata, solida, cellulis minidis pohj(/onis cortlcala ; 

 axi articulato polyslphonio. Fritct. : 1, ceramidia ovata, sporas pedicellatas 

 fasciculatas pyriformes fove)dia ; 2, tetrasporce trlangide divlsae, in ramidis 

 immersce v. in stichidiis propr'ds evolutce. 



Ehodomela. Trigenea ; frond tall, very thick and rigid, slightly branched, 

 branches subsimple, densely beset on all sides with short, setaceous, 

 acute, subsimple, rigid, fascicled, patent ramuli; ceramidia globose, 

 sessile on the sides of the ramuli. 



E,. Trigenea ; fronde elata crassismna r'ujida parcissime ramosa, ram is simpUcitis- 

 culis undique densissime ramidis obsessis, ramidis quaquaversum egredientibus 

 brevihus setaceis aciitis simpUcibus v. vix ramosis rigidis fascicidatis patenti- 

 bus, ceramidiis globosis ad ramulorum latera sessilibus. 



Trigenea australis, /JomJ. in Bot. Zeit. 1845, j?. 54. PI. Preiss. v. 2. p. 181. 

 Harv. Ner. Auslr.p. 37. Kiltz. Sp. Alg. p. 841. Harv. in Trans. R. I. 

 Acad. V. 22. p. 538. 



Ehodomela vestita, Harv. MSS. in Herb. (1838). 



IIab. Cast ashore. Fremantle, Bac/c/iouse, Preiss, G. Clifton, W. H. H., 



South Australia, Dr. Citrdie. Port Phillip Heads, Dr. F. Miiller. 

 Geogii. Distr. West and south coasts of Australia. 



Descr. Root ? Trond 12-16 inches long, \\-l lines in diameter, very opaque, 

 dividing irregularly into 8-4 branches, or simply forked, with wide rounded 

 axils. Brandies 6-8 inches long, tlexuous or incurved, simple or emitting 

 one or more shorter, lateral, secondary branches, densely clothed throughout 

 with short, subsimple, fascicled ramuli. Ramuli 6-8 lines long, setaceous, 

 spreading to all sides, horizontally patent or squarrose, simple or with one 

 or two lateral branchlets, or forking, quite opaque, with minute surface-cel- 

 lules, acute, tapering at base. Ceramidia globose, sessile on the sides of 

 the ramuli, a short distance below the apex, which is then incurved, aiu! 

 forms a sort of bract to the ceramidium. Colour a tlark, full red, b(;comiu^• 



