7 < 
Ser. RHoODOSPERMEA. Fam. Ceramiee. 
Prats CXX. ZA. 
CALLITHAMNION FLORIDULUM, ~%. 
Gun. Cuar. 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 ¢etraspores, scat- 
tered along the ultimate branchlets, or borne on little pedicels; 2, 
roundish or lobed, berry-like receptacles (/avel/e) seated on the main 
branches, and containing numerous angular spores. CALLITHAMNION 
(Lyngb.),—from xadus, beautiful, and @apvioy, a little shrub. 
CALLITHAMNION floridulum ; tufts very dense, more or less globose, fasti- 
giate ; filaments slender, dichotomous or alternately branched, the 
branches few, very erect or appressed, long, simple, straight ; articu- 
lations thrice as long as broad, cylindrical ; tetraspores oval, borne on 
very short, erect pedicels ranged im a secund manner, along the upper 
branches. 
CaLLITHAMNION floridulum, 47. Sp. Alg. vol. ii. p. 188. Harv. in Hook. 
Br. Fl. vol.ii. p. 348. Harv. Man. p.116. Wyatt, Alg. Danm. no. 219. 
Kitz. Phyc. Gen. p. 371. 
TRENTEPOHLIA floridula, Harv. in Mack. Fl. Hib. part 3. p. 218. 
ConFERVA floridula, Dillw. Conf’. Suppl. t. F. 
Has. On sand-covered rocks, near low-water mark, at all seasons. Peren- 
nial? March and April. Abundant on the Galway coast, where it 
was first observed by Wr. J. T. Mackay. Also on the Clare and 
Kerry coasts, and on the east coast of Ireland. Antrim, Dr. Scott. 
Orkney, Rev. J. H. Polleafen. Land’s End, Mr. Ralfs. 
Geoer. Distr. Coast of France. ' 
Dezscr. Filaments of equal diameter throughout, very slender, silky, closely 
packed together in dense, more or less fastigiate, roundish tufts, dichoto- 
mously or irregularly branched ; branches few, long, erect, and very straight, 
the lower ones longest, the rest gradually shorter. Ramuli few or none, 
closely pressed to the branches. Tetraspores oval, on short pedicels, 
secundly disposed along the branches. Jozuts fully thrice as long as broad. 
Colour dull pink, becoming more or less purple in drying, the bases fre- 
quently fading to a dull green. Swéstance membranaceous imperfectly 
adhering to paper. 
PEDO PI 
An exceedingly abundant species on the west coast of Ireland, 
covering a large extent of rock with its hemispherical, densely 
matted and aggregated cushions. At the close of summer great 
quantities of these, which are called jigs by the country people, 
are washed on shore, and collected as manure, though inferior 
in strength to many other marine plants. 
The fructification was discovered by Mr. Ralfs, in the year 1840. 
Fig. 4. CALLITHAMNION FLORIDULUM :—of the natural size. 2. Portion of a 
filament. 3. Apex of a branch in fruit. 4. Section of a branch, with 
tetraspores :—all more or less magnified. 
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