Ser. Ri.oDOSPEiiME^. I'^^m. Cerafdace^. 



Plate CCVII. 



4 



CALLITII AMNION SIMILE, HooLfi. d Harv. 



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

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

 coated externally witli decurrent filaments ; ramuli always pellucidly 

 articulate and monosiphonous. Fructification : IJavella generally 

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

 rous angular spores ; 2, tetmspores naked, sessile or pedicellate, distri- 

 buted on the ramuli, generally triangularly parted.— Callithamnion 

 {Lyngb.), from koXKi^, beautiful, and OafivLov, a little shrub. 



Frons filiformis, ramosa, articulata, monoslplmiia, caule ramisque majorihm 

 (in vluribus) demumfihris decurrentibus interne vel externe evolntiscorticatis 

 V firmatis ; ramulis mnper pellucide articulatis. Fruct. : \JmeU<B bmatcB 

 uxillares v ad ramos sessiles, nuda, sporas numerosas angtdatas foventes ; Z, 

 tetrasporce nadcB, ad ramulos sessiles v. pedicellata, triangulcB v. cructatim di- 

 visee. 



Callithamnion simile; frond subsolitary, robust, rigid, much branched ; 

 branches alternately or subdichotomously decompound, articulated, 

 ecorticate, at length hirsute, oppositely pinnate at every joint; pinnee 

 minute, opposite or tetrastichous, horizontally patent or recurved 

 pectinated above, more or less secundly compound; articulations ot 

 branches and ramuli once and a half to twice as long as broad, tips 

 of the ramuli acute. 

 C simile ; fronde snbsolitaria crassa rujidluscida distiche ramosissima ; ramis 

 alterne v. subdichotome decompositis articulatis ecorticatis demmn hirsutis 

 creberrime pinnatis, pinnis minutis oppositis v. tetrasticlas horizontaliter 

 patentibus recurvisve sursum pectinatis plus minus secunde decompositis ; arti- 

 culis omnibus brevibus diametro sesqui- v. subduplo longionbus, apicibus ramu- 

 lorum acutis. 

 CVLLITHAMNION simile, Ilook.fil. ct Harv. Ft. Ant. v. 1. p. 489. Kutz. Sp. 

 Alg. p. 648. /. Ag. Sp. v. 2. p. 30. Harv. in Trans. R. I. Acad. v. II. 

 p. 561. Harv. Alg. Exsic. Austr. n. 543. 

 Hab. On Fucoidea, at King George's Sound and Rottnest Island, W. H.H. 

 Tremantle, G. Clifton. Port Fairy, W. 11. H. Sealer s Cove, Dr. 

 Mueller. 

 Geogu. Diste. Kerguelen's Land, Br. Hooker. West and south coasts of Aus- 

 tralia. 

 Descr. Root discoid, afterwards a conical mass coated with curled fibres Fronds 

 erect, 1-5 inches high, either solitary or few together, distichously much 

 branched ; branches alternate crccto-patent, several times alternately divided. 



