Sf.1!. aONGYLOSPERME^. (IW) Fam. CERAMIACE^. 



Plate CVIII. 

 CERAMIUM ClTjlATJJM.—Duchtz. 



Gi;n. CnAR.^ — Frond filiform, single-tubed, articulated ; joints, and occasionally more or 

 less of the articulation, pervaded by coloured cells. Fructification of two kinds, on 

 distinct plants : 1. Favelte, roundisli, with a pellucid limbus, and generally sur- 

 rounded at the base by an involucre of few short articulated spine-like ramuli ; 

 2. Tetraspores, more or less immersed in the idtimate ramuli. Name from 

 Kepafxos, "a pitcher ;" but the name is not applicable to the fruit of any species 

 of the genus as now restricted. 



Ceramium ciliatum. — Fronds much tufted, filaments slender, cylin- 

 drical, all the branches of nearly eq^^al diameter, apices forked, strongly 

 involute ; articulations, towards the middle, three to four times longer 

 than broad, very short upwards, pellucid ; the dissepiments opaque, with 

 a whorl of stout, short, three-jointed spines round the middle ; favellse 

 " lateral, with two or three involucral ramuli ; " " tetraspores alternating 

 Avith the spines." 



Cekamidm ciliatum, — Ducluz. tlss. p. 64; Lyngh. Hyd. Dan. p. 121, t. 37; 

 Ag. Sp. Alg. vol. ii. p. 153 ; Hook. Fl. Scot, part 2, p. 14; Grev. 

 Fl. Edin. p. 311 ; Wyatt, Alg. Danm. No. 180 ; /. Ag. Alg. Medit. 

 p. 81 ; /. Ag. Advers. p. 26; Mont. FL Alyier. p. 145; Harv. in 

 Hooh. Br. Fl, vol. ii. p. 336 ; Harv. in MacTc. Fl. Hib. part 3, p. 211 ; 

 Harv. P, B. plate 139 ; Harv, Man. p. 166 ; Harv. Syn. p. 137 ; 

 Atlas, plate 52, fig. 241 ; /. G. Agardh, S2'). Gen. Alg. vol. ii. p. 133. 



Ceramium diaphanum, var. ciliatmn. — Duhy, Bot. Gall. p. 967 ; Ag. Syst. p. 134. 



EcHiNOCERAS cUiatum. — Kiltz. in Linn. vol. xv. p. 736; Kiitz. Phyc. Gen. p. 380. 



BoRYNA cillata. — Gratel. Bory, Diet. Class. Fl. Pelop. p. 77. 



Conferva ciliata. — Ellis, Phil. Trans, vol. Ivii. p. 425, t. 18, fig. h, H. ; Huds. 

 Fl. Angl. p. 599 ; Lightf. Fl. Scot. p. 998 ; With. Br. PL vol. iv. 

 p. 137 ; Dilbv. Conf. p. 77, t. 53 ; E. Bot. t. 2428. 



Conferva pilosa. — Both, Cat. Bot. vol. ii. p. 225, t. 5, f. 2, 



Hab. — On rocks, stones, shells, corallines, and the smaller Algs in the sea ; also in 

 tide-pools exposed at low water. Annual. Summer. Common. 



Geoor. Dist. — In temperate latitudes of the Atlantic and Pacific Oceans, 



Description. — Fronds densely tufted, two to four inches in length, 

 much branched ; branches slendei-, dichotomous, of nearly equal diameter 

 throughout, erect, rather rigid, without lateral ramuli, or occasionally with 

 few simple or more or less dichotomously divided ramuli, apices forked, 



