Ser. RHODOSPERME. Fam. Ceramiee. 
Pruate CCXIV. 
GRIFFITHSIA CORALLINA, 4. 
Gen. Cuan. Frond rose-red, filamentous; filaments jointed throughout, 
mostly dichotomous ; ramuli single tubed; dissepiments hyaline. 
Fruetification of two kinds on distinct individuals; 1, ¢etraspores 
affixed to whorled mvolucral’ ramuli; 2, gelatinous receptacles 
(favelle), surrounded by an involucre, and containing a mass of 
minute, angular spores. GrirrirHsta (4g.),—in honour of Mrs. 
Griffiths, the most distinguished of British Algologists. 
Grirritusta corallina; filaments dichotomous, incrassated, gelatinous ; 
axils patent ; jomts swollen upwards, pear-shaped, the ultimate ellip- 
soid; involucres sessile, those containing tetraspores whorled round 
the branch, those containing favelle lateral. 
GRIFFITHSIA corallina, 47. Syn. p.28. Hook. Fl. Scot. part 2. p. 84. Ag. 
Syst. p.145. dg. Sp. Alg. vol.ii. p.127. Harv. in Hook. Br. Fi. vol. ii. 
p- 338. Harv. in Mack, Fl. Hib. part 3. p. 212. Harv. Man, p. 103. 
Wyatt, Alg. Danm. no. 89. Kiitz. Phyc. Gen. p. 374. Endl. 3rd. Supp. p. 35. 
CALLITHAMNION corallinum, Lyngb. Hyd. Dan. p. 126. 
ConFERVA corallina, Linn. Sp. Pl. p. 1636. Lightf. Scot. p.988. With. 
vol. iv. p.136. Mohr. Isl. p. 250. Roth. Cat. Bot. vol. ii. p. 225. Dillo. 
Conf.t.98. EH. Bot. t. 1825. 
ConFERva corallinoides, Linn. Sp. Pl. ed.i. p.1166. Huds. Fl. Ang. p. 598. 
ConFERVA geniculata, Elis, in Phil. Trans. vol. lvii. p. 425. t. 18. fig. F. f. 
CoNFERVA marina gelatinosa, coralline instar geniculata crassior, Dill. Muse. 
vol. xxxili. t. 6. f. 36. 
Haz. On rocks near low-water mark, generally in deep pools. Annual. 
Summer. Not uncommon on the British shores from Orkney to 
Cornwall. 
Gzoer. Distr. Atlantic and Mediterranean shores of Europe. Feroe Islands. 
Iceland. North America. Tasmania. 
Descr. Root discoid. Fronds tufted, from two to six or eight inches in length, 
thicker than hogs’ bristles, repeatedly and pretty regularly dichotomous, 
fastigiate; the lesser branches more irregular, often alternate, slenderer 
than the rest of the frond, and tapering to a point. Azi/s in the lower 
part of the frond very wide, in the upper more and more narrow. 4rticu- 
lations two to four times longer than broad, more or less swollen upwards, 
those near the base of the stems somewhat cylindrical, those of the medial 
portions regularly pear-shaped, narrow at their lower extremity, and very 
wide above; the uppermost elliptical, connected in moniliform strings. 
Dissepiments hyaline and, as well as the border of the articulation, broad. 
Fructification : 1, tetraspores densely clustered in whorls round the joints, 
and surrounded by an involucre of short ramuli, very unequal in size, small 
