Tiate CCLXXII.
Vv.H.H.áel stliciL.
CALLITHAMNION CORYMBOSUM, Ag.
P l a t e C C L X X I I .
G e n . Ch a r . Frond rosy or browaish-red, filamentous ; stem either opake
and cellular, or translucent and Jointed; branches jointed, one-tubed,
mostly pinnate (rarely dichotomous or irregular); dissepiments hyaline.
F ru it of two kinds, on chstinot plants : 1, external tetraspores scattered
along the ultimate hranclilets, or borne on Httle pedicels ; 3,
roundish or lobed, berry-like receptacles (fa v e llò ), seated on the main
branches, and containing numerous angular spores. Callithamnion
(Lyngh.),—from saWos, beauty, and Bagviov, a little shrub.
Cal lithamnion corymbosum; frond setaceous at the base, capillary and
byssoid above, flaccid, gelatinous, excessively branched; secondary
branches alternate, repeatedly dichotomous, subflabelliform, level-
topped; ramuh many times forked, with patent axils; apices obtuse;
articulations of the branches from eight to ten times as long as
broad ; tetraspores solitary, opposite the axils of the terminal forks,
sessile, globose; faveUae binate, on truncated branches.
Callithamnion corymbosum, Ag. Sp. Alg. vol. ii. p. 165. Earv. in Eook,
Br. M. vol. Ü. p. 346. Earv. in Mack. M. Eib. part 3. p. 216. Earv.
Man. p. 113. Wyatt, Alg. Banm. uo. 93.
Callithamnion versicolor, Ag. Sp. Alg. vol. ii. p. 170. Earv. in Eook. Br.
Í7. vol. ii, p. 346. Earv. in Mack. FI. Eib. Yol.ii. p. Earv. Man.
p . 1 1 2 .
P hlebothamnion corymbosum, Kiitz. Phyc. Un. p. 375. Sp. Alg. p. 657.
P hlbbothamnion versicolor, Kiitz. Phyc. Un. p. 375. Sp. Alg. p. 657.
Ceramium corymbosum, Ag. Syn. p.xxvii. Ag. Syst. p. 138.
Ceramium versicolor, Ag. Syst. p. 140.
Conferva corymbosa, Fkg.Bot. t. 3353 (articulations too short).
H a b . On the leaves of Zostera, the fronds of various Algse, and attached
to rooks and stones, near low-water mark. Annual. Summer. Not
uncommon, from Orkney to Gornwall.
Geogr. D is t e . Atlantic and Mediterranean coasts of Europe. East coast of
North America.
Desc r. Boot minute, giving rise to a dense tuft, composed of numerous fronds.
Stem one to three inches long, the smaller specimens more slender than
human hair, the larger as thick as hog’s bristles at base, soon attenuated
and reduced to a byssoid fineness in the upper part of the plant, variable
in ramification ; sometimes dichotomous from the very base, with no trace
of a leading stem; sometimes (and more frequently) having a leading,
snbsimple stem set with closely placed, alternate branches. These branches,
in full-grown plants, are excessively divided, having an ovate or fau-shaped