Ser. RHODOSPERMEX. F;am. Ceramiee. 
Puate LXXXI. 
CALLITHAMNION FLOCCOSUM, Ag. 
Grn. Cuar. 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 ¢etraspores, 
scattered along the ultimate branchlets or borne on little pedicels; 2, 
roundish or lobed, berry-like receptacles ( favel/@) seated on the main 
branches, and containing numerous, angular spores. CALLITHAMION 
(Lyngb.\—from xaddus, beautiful, and Capviov, a little shrub. 
CALLITHAMNION floccosum; frond capillary, very flaccid, remotely much 
branched; branches alternate, erecto-patent, articulated; every joint 
producing a pair of opposite, simple, subulate, erecto-patent, 
minute ramuli; tetraspores elliptical, pedicellate, produced on the 
ramuli, near their base. 
CALLITHAMNION floccosum, 4g. Sp. Alg. vol. u. p. 158. (excl. Syn. Dillw.) 
Endl. 3rd Suppl. p. 34. 
CALLITHAMNION plumula, Lyngb.. Hyd. Dan. p. 127. (evel. var. B.)- 
CALLITHAMNION Pollexfenii, Harv. in Ann. Nat. Hist. vol. xiv. p. 186. 
t. 5. f. 5—7. 
ConFERVA floccosa, #7. Dan.'t. 828. 
Has. On submarine rocks, near low-water mark. Annual. Spring. Very 
rare. Orkney Islands, Rev. J. H. Polleafen. Aberdeen.Dr. Dickie. 
Grocer. Distr. Coast of Norway. North of Scotland. 
Descr. Fronds densely tufted, from one to four inches in length, capillary, very 
flaccid, irregularly divided into several principal branches, in an alternate or 
subdichotomous manner, the furcations rather distant ; main branches either 
naked or furnished at intervals with short, closely branched or multifid 
lateral secondary branches, having an obovate outline; all the divisions 
alternate, the axils acute, and the branches and their secondaries erecto- 
patent or erect. Filaments pellucidly articulate throughout, the articula- 
tions from two to four times as long as broad, each having a pair of oppo- 
site, subulate, simple, minute ramuli, not half a line in length, springing 
from a short distance above the middle of the articulation. Tétraspores 
elliptical, borne on short, accessory processes of the ramuli, issuing either 
on the inner or outer face. Havelle unknown in this country. 
In the year 1840, I received, from the Rev. J. H. Pollexfen, 
a specimen of this plant, gathered by him, in the previous 
summer, in one of the bays of the Orkney Islands, and not find- 
ing it to agree with the specific character of any species published 
