Ser. RHODOSPERMEiE. Fam. Ceramiacece, 



Plate XC. 



CALLITHAMNION LICMOPHORUM, iiarv. 



Gen. Char. Frond filiform, branched, articulated, monosiphonoiis, the stem 

 and branches (in many species) at length thickened internally, or 

 coated externally with decurrent filaments ; ramuli always pellucidly 

 articulate and monosiphonous, Fructification : 1, favella generally 

 in pairs, axillary or sessile on the branches, naked, containing nume- 

 rous angular spores ; 2, tetraspores naked, sessile or pedicellate, dis- 

 tributed on the ramuli, generally triangularlyparted. — Callithamnion 

 {L?/ngb.), from KaXka, beautiful, and Oa/juvLov, a little shrub. 



Fro7is filiformis, ramosa, articulata, monosiphonia, caule ramisque majorihus 

 (in plurlhus) deviumfibris decurrentibiis interne vel externe evolutis corticatis 

 v.firmatis ; ramulis semper pellucidearticulatis. Fruct. : \, favellcebinatiB, 

 axillares v. ad ramos sessiles, nuda, sporas numerosas angulatas foventes ; 2, 

 tetrasporcB nudce, ad ramulos sessiles v.pedicellata, triangulce v. crnciatm di- 

 visa. 



Callithamnion licmojpliorum ; frond flabelliform, subdichotomously de- 

 compound, the stem and principal branches at length coated exter- 

 nally with decurrent, interwoven, and anastomosing fibres ; branches 

 spreading to all sides, virgate, set throughout with alternate, flabellate 

 ramuli; ramuli dichotomous, fastigiate, their articulations 4-5 times 

 as long as broad, swollen upwards, their apices subacute ; tetraspores 

 pedicellate, solitary in the axils of the ramuli. 



C. licmopliorum ; fronde flaheUiformi subdichotovie decomposita, caule ramisque 

 majoribus denium fibris decurrentibiis intertextis anastomosantibnsque demise 

 velatis ; ramis quoquoversmn egredientihis virgatis strictis ramulis fiabellatis 

 alternis crebre ornatis ; ramulis brevibus dichotoino-midtifidis fastigiatis, ar- 

 ticulis diametro 4>-b-plo longioribus sursum incrassatis, apicibus acutiusculis ; 

 tetrasporis pedicellatis ad axillas ramulorum solitariis. 



Callithamnion licmophorum, Harv. Alg. Austr. Exsic. n. 536. 



Hab. Shortland's Bluff, Port Phillip ; and PhiHp Island, Western Port, 

 Victoria, W. H. H. 



Geogr. Distr. South coasts of Austraha. 



Descr. Root a mat of fibres, surrounding a central disc. Fronds loosely tufted, 

 4-6 inches high, and fully as much in the expansion of the branches, irre- 

 gularly divided from the base in a subdichotoraous manner, but with the 

 branches and their divisions spreading in all directions. In the young plant 

 the whole frond is pellucidly articulate ; nor do the joints of the stem or 

 branches ever become opaque, or " corticated " with internally developed 

 cellules. But they soon are coated externally with decurrent fibres, origi- 

 nating at the insertion of the ramuli, and extending downwards, clasping 

 round the branch or stem, and at length enveloping it in a filamentous 



