Ser. RHoposPERME2. Fam. Ceramiee. 
Puate CCXLII. 
CALLITHAMNION PLUMULA, Zyayi. 
Gen. Cuan. Frond rosy or brownish red, filamentous, stem either opake 
and cellular, or translucent and jointed; branches jomted, one-tubed, 
mostly pinnate (rarely dichotomous or irregular) ; dissepiments hya- 
line. Fruit of two kinds, on distinct plants; 1, external ¢e¢raspores, 
scattered along the ultimate branchlets, or borne on little pedicels; 
2, roundish or lobed, berry-like receptacles (favellz) seated on the 
main branches, and containing numerous, angular spores. CaLLt- 
THAMNION (Lyngb.),—from kados, beautiful, and Oapnor, a little shrub. 
CaLtiTHaMNion Plumula; stems distichously branched, subdichotomous, 
articulated ; each articulation bearing a pair of short, recurved plu- 
mules, pectinated on their upper margin. 
CaLLITHAMNION Plumula, Lyngb. Hyd. Dan. p.127. Ag. Sp. Alg. vol. ii. 
p-159. Harv. in Hook. Br. Fl. vol. ii. p. 339. Harv. in Mack. Fl. Hib. 
part 3, p.213. Harv. Man. p. 104. Wyatt, Alg. Danm. no. 188. 
Endl, 3rd Suppl. p. 34. Hook. fil. Fl. Antarct. vol.ii. p.489. J. Ag. 
Alg. Medit.p. 1. Kiitz, Phyc. Gen. p. 372. 
Crramium Plumula, 4g. Syn. p.62. Ag. Syst. p. 142. 
ConFrerva Plumula, Ellis, Phil. Trans. p.57.t.18. Dillw. t. 50. 
ConFeERva Turneri, Sm. E. Bot. t. 1637 (not 2339). 
Has. On rocks and Alge, near low-water mark, and in 4—15 fathoms 
water. Annual. Summer. Not uncommon, from Orkney to Corn- 
wall. 
Geogr. Distr. Atlantic shores of Europe and North America. Mediterranean 
Sea. Cape Horn, Dr. Hooker. Tasmania, Gunn. 
Descr. Root, a small disc. Fronds densely tufted, from two to six inches in 
length, capillary, flaccid, distichously branched, the branches alternate or 
subdichotomous, repeatedly divided. The stems are articulated to the base, 
and every articulation, of the main stems as well as of the branches and 
their divisions, bears a pair of opposite, minute ramuli or plumules, inserted 
a short way below the apex of the articulation, and very much more slender 
than the part from which they spring. In luxuriant specimens four plumules 
instead of two, are frequently found. These plumules are from half a 
line to a line in length, spreading horizontally or somewhat reflexed, and 
pectinated, or bi-tripectinated along their upper faces; the ramuli of the 
combs standing at an angle of 45° with the rachis. Every articulation of 
the rachis bears its ramulus, with great regularity. The ¢etraspores are 
borne on the tips of the ultimate ramuli; they are therefore pedicellate. 
The favelle are densely clustered, and terminate the main branches, which 
are there always shortened. The colour is a fine carmine, sometimes brownish; 
and is well preserved in drying. The substance is soft and tender, and the 
plant closely adheres to paper. 
PIP ee 
B 2 
