Ser. KHODOSPERMEiK. Fam. Gelidiacea? 



Plate CXIV. 



THAMNOCLONIUM LEMANNIANUM, Harv. 



Gen. Char. Frond dendroid or flabelliform, compressed or plane, imper- 

 fectly costate, rigidly horny or coriaceous, mostly covered with spi- 

 nous tubercles, composed of two strata ; the medullarij stratum very 

 dense, of slender, cylindrical, longitudinally seriated cellules ; cortical 

 of roundish-angular, coloured cells. Fructification: 1, Ci/stocarps ? ; 

 2, cruciate tetraspores, contained in nemalhecia. — Thamnoclonium 

 {Kiitz.), from Oafxvo<i, a shrub, and k\cov, a branch. 



Frons dendroidea v. flabell'iformh, conipressa v. plana, immo'se costata, rigide 

 cornea et corlacea, scepissime spbmloso-verrucosa, strath daobus coniposita ; 

 strata medullari densisslmo, cellulis cyliudraceis gracilibus lomjitiidlnaliter 

 seriatis ; corticali cellulis rotundato-angidatls coloratis for mato. Fruct. : 1, 

 cystocarpia ignota ; 2, tetrasporce cruciatim divisa, in nematlieciis propriis 

 ecolutce. 



Thamnoclonium Lemanniamim ; frond dendroid, the stem cylindrical ; 

 branches winged below, expanding upwards into flat, strongly mid- 

 ribbed phyllodia, at length proliferously much branched; phyllodia 

 linear-cuneiform, sinuoso-pinnatifid, covered with muricated warts, 

 and traversed by a vanishing, immersed midrib; apices and lacinise 

 very obtuse. 



T. Lemannianura ; fronde dendroidea, caule cyUndraceo ; ramis hasi alatis 

 sursnni in pJiyllodia plana costata explanatis demum prolifere ramosissimis ,- 

 pJiyllodiis lineari-cuneiformibus sinuoso-pinnatifidis creberrime echinato-verru- 

 cosis costa evanescente immersa percursis ; apicibus laciniisque obtusis. 



Thamnoclonium Lemannianum, Harv. in Trans. R. I. Acad. v. 22. p. 538. 

 Harv. Alg. Aiistr. Exsic. n. 154. 



Hab. Cast ashore at Fremantle, Mr. Mylne, W. H. H. 



Geogr. Distr. Western Australia. 



Descr. Root a tuber, as large as a hazel-nut, with a few stout, clasping, short 

 branches. Stem 2-4 lines in diameter, cylindrical, very hard and woody, 

 branched ; the branches dividing irregularly, soon becoming winged at the 

 edges, and passing upwards into the bases of strongly ribbed phyllodia. 

 Fhyllodia 4-6 inches long, linear-oblong or subcuneate, obtuse, tapering 

 at base, the margin either sinuate or deeply incised in an alternately pin- 

 natifid manner ; the lobes few and very erect, linear-oblong, obtuse, 

 traversed by an immersed midrib, which generally becomes faint or dis- 

 appears altogether beyond the middle. The surface is thickly covered with 

 minute echinated warts, which give it a rough feel, and an appearance to the 

 naked eve of coarse shagreen. These warts are of different sizes, small and 



