Ser. RHoposPERMEA. Fam. Ceramieg. 
Piate CCXXX. 
CALLITHAMNION ROSEUM, Zyngo. 
Grn. Cuar. Frond rosy, or brownish-red, filamentous; stem either opake 
and cellular, or translucent and jointed; branches jointed, one-tubed, 
mostly pinnate (rarely dichotomous or irregular) ; dissepiments hya- 
line. /ruit of two kinds on distinct plants; 1, external ¢etraspores, 
scattered along the ultimate branchlets, or borne on little pedicels ; 
2, roundish or lobed, berry-like receptacles (favel/z), seated on the 
main branches, and containing numerous, angular spores. CaLLt- 
THAMNION (Lyngb.),—from xados, beautiful, and Gaynor, a little shrub. 
CAaLLITHAMNION rosewm; stems much and loosely branched; secondary 
branches long, flexuous, subdistichously plumulate; plumules lax, 
with a roundish outline, crowded towards the tops of the branches, 
simply pinnate; pinne long, spreading, curved; articulations of the 
stem and branches four and five times as long as broad, more or less 
filled with ves; those of the pinne twice or thrice as long as 
broad; tetraspores elliptical, four or five on each pinna, from the 
lower joints; favelle tufted. 
CALLITHAMNION roseum, Lyngb. Hyd. Dan. p. 126. t.39(?). Ag. Sp. Aig. 
vol. ii. p. 164. Harv.in Hook, Br. Fl. vol.ii. p. 341. Harv. in Mae. Fl. 
Hib. part 3. p. 214. Harv. Man. p.106. Wyatt, Alg. Danm. no. 44. Endl. 
3rd Suppl. p. 34. 
PHLEBOTHAMNIUM roseum, Kiitz. Phyc. Gen. p. 375. t. 44. f.1. 
CERAMIUM roseum, Roth, Cat. Bot. vol. ii. p.145. Ag. Syst. p. 139. 
ConFrerva rosea, H. Bot. t.966. Dillw. t.17 (??). 
Has. On rocks and the larger Fuci, near low-water mark; frequently in 
estuaries, or muddy places. Annual. Summer. Not uncommon. 
Geoer. Distr. Atlantic shores of Europe. 
Descr. Fronds densely tufted, three or four inches long. Stems as thick as hog’s 
bristle at the base, in young plants pellucid, but in old, opake and full of 
veins, or internal fibres, excessively branched and bushy; the branches 
alternate, repeatedly divided. Lesser branches somewhat virgate, set 
throughout their length, at nearly every joint, with alternate simply pinnated 
plumules, of roundish or ovate outline. Pinne long, more or less incurved, 
either quite simple, or furnished with one or two small pinnule near the 
apex. -drticulations of the stem and branches four or five times as long as 
broad, or more, somewhat swollen at the joints ; those of the lesser branches 
and ramuli gradually shorter. Endochrome nearly filling the tube. Tetraspores 
elliptical, sessile on the inner faces of the pinnz, one at each of the four 
or five lowermost joints. Favel/e generally terminating truncated branches, 
two or more together: sometimes several united in a berry-like mass. 
Colour in young specimens a fine purple-lake, in old brownish, becoming 
brighter in fresh-water. Suéstance membranaceous and soft, closely ad- 
hering to paper, but not gelatinous. 
SPO PPP IAAP 
