Ser. RHODOSPERMEA. Fam. Corallinee. 
Prats CCXXXIV. 
JANIA CORNICULATA, Zamour. 
Gen. Cuar. Frond filiform, articulated, dichotomously branched, coated 
with a calcareous deposit. Mructification urn-shaped ceramidia, formed 
of the axillary articulation of the uppermost branches (mostly two 
horned), pierced at the apex by a minute pore, and containing a tuft of 
erect, pyriform, transversely parted ¢e¢raspores. Janta (Lamour.),—— 
I suppose from Janira, one of the Nererdes. 
JANtA corniculata ; articulations of the principal divisions obconical, com- 
pressed, their upper angles sharp and prominent; those of the upper- 
most ramuli cylindrical, filiform. 
JANtA corniculata, Lam. Cor. Flex. p. 274.  Corall. p.123. Gray, Nat. Ar. 
Br, Pl, vol.i. p. 339. Flem. Brit. Anim. p.514. Johnst. Spong. and Lith. 
p- 227. Decne. Ess.p. 111. Endl. 3rd Suppl. p.49. Kiitz. Phyc. Gen. 
p- 389. 
Coratitna corniculata, Linn. Syst. p. 806. Pal. Elench. p. 424. Ellis and 
Soland. Zoop. p.121. Turn. Br. Faun. p. 212. Lam. An. s. Vert. 2nd Ed. 
vol. ii. p. 517. 
Has. Parasitical on the smaller Algz, in rock pools between tide-marks, 
and in 4-5 fathoms water. Perennial? Summer. Southern shores 
of England and Ireland. Jersey, Miss Turner. 
Geoar. Distr. Atlantic and Mediterranean shores of Europe. 
Descr. Fronds densely tufted, one or two inches high, repeatedly dichotomous, 
fastigiate, the branches spreading, gradually attenuated towards the apex. 
In young specimens the branching is always regularly forked, but older 
specimens frequently show in their lower parts a disposition to become pin- 
nated, from lateral opposite ramuli issuig from their joints. These 
ramuli, as well as the terminal forkings, are much narrower than other parts 
of the frond. Articulations of the principal branches twice or thrice as 
long as broad, tapering to the base, gradually enlarged upwards, compressed, 
their upper angles more or less produced, sometimes extending at each side 
into a long conical horn; articulations of the lesser branches and ramuli 
cylindrical. Ceramidia urn-shaped, in the upper axils. On maceration in 
acid, transverse striz become visible in the articulations. 
The genus Jana, if we confine it to the dichotomously 
branched species, may be allowed to stand as distinct from Coral- 
lina—at least in habit ;—but it must be admitted that the two 
genera approach very nearly, if they do not rather merge one in 
the other. Had we only to consider European forms we might 
think differently. But the shores of warm countries, and espe- 
