Ser. RHopDOSPERME. Fam. Ceramiee. 
Prats CCCXXXI. 
CALLITHAMNION AFFINE, Zam. 
Gen. 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 hy- 
aline. Fruit 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/e) seated on the main 
branches and containing numerous angular spores. CALLITHAMNION 
(Lyngb.),—from xaddos, beauty, and Gaynor, a little shrub. 
CALLITHAMNION affine; much branched and bushy, the stem rather opake, 
full of veins; secondary branches long, having a roundish outline, 
alternately plumulate ; plumules very narrow, simply pinnate ; pinne 
short, erect, increasing in length upwards, alternate, crowded at top ; 
articulations of the branches three or four times, of the pinne once 
and a half as long as broad ; tetraspores generally solitary, rising from 
the basal cell of the pinne. 
CALLITHAMNION affine, Harv. in Hook. Br. Fl. vol. ii. p. 344. Harv. Man. 
ed. 1. p. 110. ed. 2. p. 180. ; 
Has. Parasitical on Fuci, between tide-marks. Annual. Summer. Shores 
of Bute, Dr. Greville. 
Geoer. Distr. 
Descr. Tufts two to three inches high, with a somewhat pyramidal outline, the 
lower branches being longest, the upper gradually shorter. Filaments with 
a percurrent, nearly undivided stem, closely set, on all sides and through- 
out its whole length, with lateral branches. These are once or twice divided, 
and clothed with very narrow, elongate, erect, and slender, simply pinnated 
plumules, alternate, one rising from every joint of the branch. Pinnules 
short, erect, awl-shaped, the lowermost shortest and subdistant, the upper 
gradually longer and closer together, the terminel ones crowded and short. 
Main stem full of slender veins, and sub-opake, its articulations twice or 
thrice as long as broad. Articulations of the branches thrice or four times 
as long as broad, with wide margins; those of the pinnules about once and 
a half as long as broad. Tetraspores globose, and mostly solitary, at or 
near the base of the pimnules. avel/e in pairs, on slightly distorted 
branches, each favella occupying the place of a suppressed ramulus. Colour 
a deep red, pretty well preserved in drying. Swdstance membranaceous. 
In drying, the plant adheres closely to paper. 
OI Ent 
