Ser. RHODOSPERME. Fam. Corallinee. 
Prats CCLILI. 
JANIA RUBENS, Lamour. 
Gen. Cuar. Frond filiform, articulated, dichotomously branched, coated 
with a calcareous deposit. Fruetification, wm-shaped ceramidia 
formed of the axillary articulation of the uppermost branches (mostly 
two horned), pierced at the apex by a minute pore, and contaiming a 
tuft of erect, pyriform, transversely parted t¢etraspores. JANIA,— 
(Lamour), from Janira, one of the Nereides. 
Janta rubens; articulations of the principal branches and ramuli cy- 
lindrical, about four times as long as broad. 
Janta rubens, Lam. Cor. Flex. p. 272. Gray, Brit. Pl. vol.i. p.339.  Flem. 
Brit. An. p.514. — Johnst. Brit. Lith. p. 224. Dune. Ess. p. 111. Endl. 
3rd Suppl. p.49. Kiitz. Phyc. Gen. p. 389. 
Cora.ina rubens, Ellis and Soland. Zooph. p.123. Turt. Brit. Faun. p. 211. 
Lam. An. s. Vert. 2nd edit. vol. ii. p. 517. 
Has. Parasitical on the smaller Alge, between tide-marks. Perennial. 
Summer. On all parts of the British Coast. 
Grocer. Distr. Shores of Europe. South Africa. 
Descr. Fronds from halfan inch to an inch and a half in height, densely tufted, 
dichotomous, many times forked, fastigiate; branches either erect or 
spreading, gradually attenuated toward the apices. Articulations cylindrical 
in all parts of the frond, without prominent angles; those near the base very 
short, the upper ones gradually longer; those in the middle parts of the 
frond from four to five times longer than broad. Apical articulations either 
acute or obtuse, sometimes much attenuated, and sometimes nearly as robust 
as in other parts of the frond. Ceramidia subterminal, urnshaped, with 
long horns formed of from two to four articulations. When deprived of its 
lime by acid, the frond is distantly banded with dark, transverse stri. 
Colour a pale red, with purplish shades when quite fresh. 
Ne 
PID 
The commonest species of the genus Jania and the most widely 
diffused, abounding along the shores of Europe and having 
been brought also from the Southern Ocean. I have specimens 
from South Africa which nearly accord with those from our own 
coasts. It probably occurs on the American shore in equal 
abundance. 
From J. corniculata (tab. nost. CCXXXIV.) which it out- 
wardly much resembles, /. vdens may, at once, be known by the 
E2 
