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P l a t e CLXXXI.
CERAMIUM RUBRUM, Ag.
G e n . Ci ia e . 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, tetraspores, either immersed in the ramuli, or more
or less external ; 2, sessile, roundish receptacles [fa v e lla ), having a
pellucid limbus, containing minute, angular spores, and subtended by
one or more short, involucral ramnli. Ceeamium [Roth),—from
Kepagos, a pitcher, bnt the fruit is not pitcher-shaped.
Ceeamium rubrum ; filaments robust, gradually attenuated upwards, irre-
g-ularly dichotomous, with lateral, forked or multifld ramidi, the apices
hooked inwards; articulations coated with coloured cellules, unarmed,
the lowermost twice as long as broad, the upper shorter than
their breadth; dissepiments constricted; tetraspores immersed in the
articulations, whorled ; favellæ globose, mostly borne on the lateral
branchlets, subtended by three or four involucral ramuli.
Ceeamiüm rubrum, Ag. Syn. p. 60. Lyngb. Hyd. Dan. p. 118. tab. 62. B . 1.
Hook. FI. Scot. p a rt 2. p. 84. Ag. Syst. p. 135. Grev. FI. Fdin. p. 810.
Ag. Sp. Alg. vol. ii. p. 146. Harv. in Hook. Brit. Ft. vol. ii. p. 336.
Wyatt, Alg. Lanm. no. 42. Harv. in Mack. FI. Hib. p a rt 3. p. 210.
J. Ag. Alg. Medit. p. 81. Fndl. 3rd Suppl. p. 36. Kütz. Phyc. Gen. p. 381.
Ce eamium virgatum. Both, Cat. Bot. vol. i. t. 8. f. 1. FI. Germ. p. 461.
Ceeamium elongatum. Both, Cat. vol. ii. p. 178. LO. FI. Fr. vol. ii. p. 44.
Ceeamium axillare, LO. Syn. p. 9.
Ceeamium nodulosum, Lucluz. Fss. p. 61 DC.
CoNEEBVA rubra, Huds. FI. Ang. p. 600. Wit)
F. Bot. 1 .1166. Dillw. Gonf. t. 34. FI. Ban.
Conferva nodulosa, Lightf. FI. Scot. p. 994.
Conferva tubulosa, Huds. FI. Ang. p. 600.
Conferva flosculosa, FUis. Phil. Tr. 57. p. 425. t. 18.
Var. (3. secundatum-, lateral ramuh mostly secund.
Syn. p. 9.
i. B r. PI. vol. iv. p. 138.
1 .1482.
Ce eamium secundatum, Lyngb. Hyd. Ban. p. 119. 1 .18.
H a b . Growing on rocks, stones, and the smaller Algæ 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 abundant
on all parts of the British coasts.
Geogr. D is t r . Abundant tbrougliout tbe temperate zones of both hemispheres ;
also in tbe tropical ocean, both east and west.
D esc r. Boot scutate. 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
■fl
ifol