Ser. RHopDOSPERMEA. . Kam. Ceramiea. 
Puate CXXIX. 
CALLITHAMNION BRODIAI, Aare. 
Gen. Cuar. Froud 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 ¢et¢raspores, scat- 
tered along the ultimate branchlets, or borne on little pedicels; 2, 
roundish or lobed, berry-like receptacles (/avel/g) seated on the main 
branches, and containing numerous angular spores. CALLITHAMNION 
(Lyngb.),—from «ddrus, beautiful, and Oaprior, a litile shrub. 
CatiitHaMnion Brodie: ; stem sub-opake, veiny, obscurely jointed, slender, 
simple, furnished throughout with densely inserted, patent, lateral 
branches; branches furnished at each joint, with short, quadrifarious, 
secondary-branches with a narrow hastate outline; plumules alternate, 
subsimple, pinnate, ovate, their pihnules patent, frequently with a few 
secund processes near the apex ; tetraspores oval, sessile near the tips 
of the pmnules, or on their accessory processes ; favelle bilobed, on 
the secondary branches. 
CALLITHAMNION Brodiei, Harv.. in Hook. Br. Fl. vol. ti. p.105. Harv. 
Man. p.105. Wyatt, Alg. Danm. no. 184. 
Has. Parasitical on Algze, near low-water mark. Annual. Summer. Rare. 
Forres, Mr. Brodie. Coast of Northumberland, Mr. Robertson. 
Torquay, Mrs. Griffiths and Miss Cutler. Cornwall, Mr. Ralfs. 
Geoer. Distr. British Islands. 
Duscr. Root disciform. Fronds tufted, from one to three4nches high, with 
a conical outline. Stem mostly simple, as thick as hog’s bristle, smooth, or 
in old specimens slightly shaggy, opake below, more or less evidently 
joited above, the joints full of longitudinal ves, furnished throughout 
their length with very closely set, lateral, quadrifarious, patent branches, 
the lowermost of which are longest, the rest gradually shorter upwards. 
Branches more or less evidently jomted, the joints twice or thrice as long as 
broad, and full of veins, simple, like the stem, and like it densely clothed 
with a second, and in luxuriant specimens, a third series of lesser branches, 
gradually decreasing in size, but of a similar character. These secondary 
branches have a very narrow hastate outline, and are plumulate at every 
joint, the plumules somewhat spirally alternate, gradually diminishing in 
size and composition from the base to the apex. Plwmules small, ovate, 
pinnate, sessile, with a flexuous rachis; their pinnules simple, patent, or 
erecto-patent, often furnished with a few secund processes towards the 
apex; apices sub-acute. Joimts of the plumules once and a half to twice 
as long as broad. Tetraspores oval, sessile, one or two together, on the 
processes of the pinnules. Fave//@’ generally two-lobed, large, irregularly 
bursting out of the sides of the lesser branches, which are then frequently 
distorted. Colour brownish-red. Sudstance cartilagineo-membranaceous, 
