? 
Ser. RHoposPERME. Fam. Ceramiea. 
Piate CLXV. 
CALLITHAMNION BARBATUM, 4. 
Gey. 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 ‘efraspores, scattered 
along the ultimate branchlets, or borne on litile pedicels; 2, roundish 
or lobed, berry-like receptacles (fave//z) seated on the main branches, 
and containmg numerous angular spores. CaLLirHamnion (Lyngb.), 
—from xados, Leautiful, and @apnor, a little shrub. 
CALLITHAMNION Jarhatum; stems (rising from creeping filaments?) much 
and irregularly branched ; branches mostly alternate, long, subsimple, 
naked, or pmmnulated with minute, opposite, spine-like, erecto-patent 
ramuli; articulations twice or thrice as long as broad; tetraspores 
elliptic oblong, with a wide limbus, sessile on the sides of the pmnule. 
CaLLITHAMNION barbatum, 4g. Syst. Alg. vol. i. p. 181. Harv. Man. 
p- 114. J. 4g. Alg. Medit. p. 70. Endl. 3rd Suppl. p.34. E. Bot. 
Suppl. t. 2889. 
CALLITHAMNION Ralfsii, Harv. in Herb. (1838.) 
Has. On mud-covered rocks, in the sea, between tide-marks. Very rare. 
Perennial? Ilfracombe, and on the quay at Penzance, Mr. Ralfs. 
(1838.) Dredged at Weymouth, Rev. Wl. J. Berkeley. 
Geoer. Distr. Mediterranean Sea. 
Descr. Filaments forming intricate tufts, densely matted together and apparently 
connected at base by creeping fibres, but difficult to disentangle ; one to two 
inches high, much and irregularly branched ; branches alternate or opposite, 
erect, long, simple, or bearing others similar to themselves, their upper half 
closely pinnulated with very short, opposite, spine-like, erecto-patent ramuli, 
their lower part either naked or irregularly pinnulated with similar ramuli. 
Articulations cylindrical, twice or thrice as long as broad. Tetraspores 
. elliptic-oblong, with a very wide limbus, borne on the sides of the ramuli, 
sessile, mostly solitary. Favelie unknown. Swudstance membranaceous and 
somewhat rigid, imperfectly adhering to paper. Colour a dull brownish- 
red, without gloss. 
Rn LLL 
To the naked eye, this species, unless closely examined, 
resembles a ragged specimen of C. floridulum, though when 
compared under a Jens with that plant the two are seen to be 
abundantly different. The short opposite ramuli which feather 
the ends of the branches of C. Jarba‘um, and which are most 
abundant in summer specimens, though perhaps always to be 
