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Ser. RHoDOSPERME. Fam. Ceramiee. 
Pirate CLXXXI. 
CERAMIUM RUBRUM, ~%. 
Gen. Cuan. Frond filiform, one-tubed, articulated ; the dissepiments coated 
with a stratum of coloured cellules, which sometimes extend over the 
surface of the articulation... Fructification of two kinds, on distinct 
individuals ; 1, ¢etraspores, either immersed in the ramuli, or more 
or less external; 2, sessile, roundish receptacles (favelle), having a 
pellucid limbus, containing minute, angular spores, and subtended by 
one or more short, mvolucral ramuli. Crramium (Roth),—from 
xepapos, a pitcher, but the fruit is not pitcher-shaped. 
Creramium rubrum; filaments robust, gradually attenuated upwards, irre- 
gularly dichotomous, with lateral, forked or multifid ramul, the apices 
hooked inwards; articulations coated with coloured cellules, un- 
‘armed, the lowermost twice as long as broad, the upper shorter than 
their breadth; dissepiments constricted ; tetraspores immersed in the 
articulations, whorled ; favelle globose, mostly borne on the lateral 
branchlets, subtended by three or four involucral ramuli. 
CEeRaMiuM rubrum, 4g. Syn. p.60. Lyngb. Hyd. Dan. p. 118. tab. 62. B.1. 
Hook. Fl. Scot. part 2. p. 84. Ag. Syst. p.135. Grev. Fl. Edin. p. 310. 
Ag. Sp. Alg. vol. ti. p. 146. Harv. in Hook. Brit. Fl. vol. ii. p. 336. 
Wyatt, Alg. Danm. no. 42. Harv. in Mack. Fl. Hib. part 3. p. 210. 
J. Ag. Alg. Medit. p.81. Endl. 3rd Suppl. p. 36. Kaitz. Phyc. Gen. p. 381. 
CERAMIUM virgatum, Roth, Cat. Bot. vol.i.t.8.f.1. Fl. Germ. p. 461. 
Creramium elongatum, Roth, Cat. vol. il. p.178. DC. Fl. Fr. vol. ii. p. 44. 
CERAMIUM axillare, DC. Syn. p. 9. 
CrraMium nodulosum, Ducluz. Ess. p.61 DC. Syn. p. 9. 
Conrerva rubra, Huds. Fl. Ang. p.600. With. Br. Pl. vol. iv. p. 138. 
E. Bot. t.1166. Dillw. Conf. t. 34. Fl. Dan. t. 1482. 
Conrerva nodulosa, Lightf. Fl. Scot. p. 994. 
) Conreryva tubulosa, Huds. Fl. Ang. p. 600. 
| Conrerva flosculosa, Ellis. Phil. Tr. 57. p. 425. t. 18. 
| Var. 8. secundatum ; \ateral ramuli mostly secund. 
| CERAMIUM secundatum, Lyngb. Hyd. Dan. p. 119. t. 18. 
Has. Growing on rocks, stones, and the smaller Alge in rock-pools from 
near the extreme of high water to low-water mark; also dredged in 
four or five fathoms. Annual. Summer and autumn. Very abun- 
dant on all parts of the British coasts. 
Grocer. Distr. Abundant throughout the temperate zones of both hemispheres ; 
> 
also in the tropical ocean, both east and west. 
Descr. Root seutate. Filaments solitary or tufted, from one or two to twelve 
inches long, or more, as thick as hog’s bristle, or twice as thick in the 
