Ser. GOXGYLOSPKKME/E. ( 87 ) Fam. CERAMIACE^. 



Plate C. 

 CERAMIUM RUBEUM.— yl^. 



Gen. Char. — Frond filiform, single tubed, articulated ; joints, and occasionally more or 

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

 distinct plants: 1. Favellre, roundish, with a pellucid limbus, and generally sur- 

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

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

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

 of the genus as now restricted. 



Ceramium riihrum. — Fronds filiform, much branched ; main divisions 

 dicliotomous, lesser ones irregular, capillaceo-multifid, the whole of the 

 articulations pervaded by coloured cells ; those of the main stems about 

 twice, those of the ramuli half as long as broad; favellse globose, 

 smTounded by about four spine-like ramuli. 



Ceramium ruhrum. — Ag. Syn. p. 60 ; Lymjh. Hyd. Dan. p. 118, t. 62 b, 1 ; 

 Hooh. Fl. Scot, part 2, p. 84 ; Ag. Syst. p. 135 ; Grev. Fl. Edin. 

 p. 310 ; Ag. Sp. Alg. vol. ii. p. 146 ; Wyatt, Alg. Damn. No. 42 ; /. 

 Ag. Alg. Medit. p. 81 ; Endl. 3rd Suppl. p. 36 ; Kiltz. Phyc. Gen. 

 p. 381 ; Harv. in Hooh. Br. Fl. vol. ii. p. 336 ; Harv. in Mack. Fl. 

 Bib. part 3, p. 210 ; Harv. P. B. plate 181 ; Harv. Man. p. 161 ; 

 Harv. Syn. p. 130 ; Atlas, plate 53, fig. 242 ; Harv. N. B. A. part 2, 

 p. 213 ; /. G. Agardh, Sj). Gen. Alg. vol. ii. p. 127. 



Ceramium virgatuni.—JRoth, Cat. Bot. vol. i. t. 8, f. 1 ; Fl. Germ. p. 461. 



Ceramium elongatum. — Roth, Cat. Bot. vol. ii. p. 173 ; De C. Fl.Fr. vol. ii. p. 44, 



Ceramium axillare. — De C. Syn. p. 9. 



Ceramium nodulosum. — Ducleauz. Ess. p. 61 ; De C. Syn. p. 9. 



Conferva rubra.— Huds. Fl. Angl. p. 600 ; With. Br. PI. vol. iv. p. 138 ; E. 

 Bot. t. 1166 ; Dillw. Conf. t. 34 ; Fl. Dan. t. 1482. 



Conferva nodulosa. — Lightf. Fl. Scot. p. 994. 



Conferva tubulosa. — Huds. Fl. Angl. p. 600. 



Conferva flosculosa. — Ellis, Phil. Tr. 57, p. 425, t. 18. 



Var. /3. secundatum. — Lateral ramuli mostly secund. 



Harv. P. B. descrp. plate 181 ; Lyngh. Hyd. Dan. p. 119, t. 18 ; /. G. Agardh, 

 Sp. Gen. Alg. vol. ii. p. 127. 



Hab. — Growing on rocks, stones, old shells, and the smaller Algse in rock-pools, from 

 high to low-water mark ; also in deep water. Annual. Summer. Very common. 



Geogr. Dist. — Throughout the temperate zones of both hemispheres ; also in the 

 tropical ocean, east and west. 



