Ser. RaoposPeERME#. Fam. Ceramiee. 
Pirate CCLX XIX. 
CALLITHAMNION HOOKERI, 4. 
Gen. Coax. 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 hyaline. 
Fruit of two kinds, on distinct plants: 1, external tetraspores, scat- 
; tered 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. CALLITHAMNION 
(Lyngb.), from xaddos, beauty, and 6apnor, a little shrub. 
CattirHamNnion Hooker: ; stem setaceous, inarticulate or nearly opake, 
with traces of jomts, simple, set with one or more series of alternate, 
spreading, flexuous branches, the smaller of which are articulated, 
and all densely plumulate ; plumules patent, naked below, pinnate or 
subbipinnate above ; the pinne or pinnules subhorizontal or divari- 
cate, the lowest longest; articulations twice or thrice as long as 
broad ; tetraspores numerous, sessile on the pinnules; favelle ter- 
minal, binate. 
CaLLITHAMNION Hookeri, 4g. Sp. Alg. vol. u. p.179. Harv. in Hook. Br. 
Fl. vol. ii. p. 341. Harv. Man. ed. 1. p. 106. 
CALLITHAMNION lanosum, Harv. in Hook. Br. Fl. vol.u. p. 341. Wyatl, 
Alg. Dan. no. 139. 
CALLITHAMNION spinosum, Harv. in Hook. Br. Fl. vol.ii. p. 345. Harv. 
Man. ed. 1. p. 111. 
PHLEBOTHAMNION Hookeri, Kiitz. Phyc. p. 375. Sp. Alg. p. 653. 
PHLEBOTHAMNION spinosum, Aiitz. Sp. dig. p. 653. 
Ceramium Hookeri, 4g. Syn. p. xxv. Hook. Fl. Scot. part 2. p. 85. Ag. 
J 
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Syst. p. 138. 
ConFrerva Hookeri, Dillw. Conf. t. 106. 
Has. On various Alge between tide-marks, also on rocks near low waier- 
mark, and at a greater depth. Annual. Summer. Dispersed along 
the British shores, from Orkney to Cornwall, and in Ireland; not 
uncommon. 
Goer. Distr. Atlantic shores of Europe: but rare. 
Descr. Root a minute disc. Fronds densely tufted, one to four inches in length, 
and as much in expansion, having a conical or pyramidal outline, the lower 
branches being longest, the rest gradually shorter upwards, not perfectly 
d distichous, and sometimes densely bushy, with branches turned in every 
direction. Stem mostly undivided, as thick as a hog’s bristle, opake and full 
of veins, or (in young specimens) obscurely marked with joints, closely set 
throughout with lateral, very patent branches, similar to the main stem. 
Weeks. TEI. M 
