Ser. RnoposrprrMex. . Fam. Ceramiee. 
Piate CCCXXV. 
CALLITHAMNION MESOCARPUM, Carm. 
Gen. Car. 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 (favelle) seated on the 
main branches, and containing numerous angular spores. CaLLI- 
THAMNION (Lyngb.),—from xadXos, beauty, and Caunor, a Little shrub. 
2 CALLITHAMNION mesocarpum ; stems rising from creeping filaments, erect, 
: simple or sparingly branched ; branches alternate, very erect, naked, 
* or having a few, scattered, erect ramuli; articulations four or five 
times as long as broad; tetraspores*elliptical, on long, simple or 
forked, lateral pedicels. 
CALLITHAMNION mesocarpum, Carm. Alg. Appin. MSS. Harv. in Hook. Br. 
Fl. vol. ii. p, 348. “Harv. Man. ed. 1. p. 116. ed. 2. p. 184, Kiitz. Sp. Alg. 
p- 642. 
Has. On rocks at the extremity of low-water mark, very rare. Appin, 
Capt. Carmichael. 
Geoer. Distr. 
Descr. “ Tufts continuous, forming a broad, shaggy, purple crust.” Carm. 
_ Stems from an eighth to a quarter inch or rather more in height, springing 
from decumbent filaments, which are attached to the surface of the rock by 
little rootlets, erect, simple or having two or three alternate or secund 
branches. Branches issuing at very acute angles, erect, virgate, either quite 
naked or furnished with a few, distant, erect, scattered, few-jointed ramuli. 
Articulations four or five times as long as broad, with wide borders. Tetra- 
spores elliptical, borne on the tips of the lateral ramuli, which are generally 
one-jointed and either simple or forked, in which case, one arm of the fork 
is converted into a tetraspore. avelle unknown. Colour a full deep lake. 
Substance membranaceous, adhering to paper in drying. 
OLLIE 
Capt. Carmichael, in describing this plant, says, “I could not 
discover that it sprang from creeping filaments ;’—a remark 
which induced me formerly to place it in the section with 
C. Rothii and C.floridulum. But on recently inspecting Capt. 
VOL. III. Z 
