p /H , r c L H .
P l a t e CCLII.
JANIA RUBENS, Lamour.
G en. Ch ar . Frond filiform, a rticu la te d , dichotomously b ra n c h ed , coated
with a calcareous d ep o sit. Fructification, u rn -sh a p e d ceramidia
formed of th e axillary a rtic u la tio n of th e u p p e rm o s t b ran c h e s (mostly
two h o rn e d ), pie rc ed a t th e apex b y a m in u te pore, a n d co u ta in in g a
tu f t of erect, pyriform, tran sv e rse ly p a rte d tetraspores. J ania,—
[Lamour), from Janira, one of th e Nereides.
J a n i a ruhens ; articulations of the principal branches and ramuli cylindrical,
about four times as long as broad.
J ania rubens, Lam. Cor. Ilex. p. 272. Cray, Brit. PI. vol. i. p. 339. Mem.
Brit. J u . p. 514. Jolmst. Brit. Lith. p. 224. Due. Ess. p. 111. Endl.
3rd Suppl. p. 49. KiiU. Phyc. Gen. p. 389.
CoEALLiNA rubens, Ellis and Soland. Zooph. p. 123. Turt. Brit. Eaun. p. 211.
Lam. An. s. Vert. 2nd edit. vol. ii. p. 617.
H ab. Parasitical on the smaller Algæ, between tide-marks. Perennial.
Summer. On all parts of the British Coast.
Geoge. Dis t e . Shores of Europe. South Africa.
D esc e . Eronds from half an 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. A pkal 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. Wlien deprived of its
lime by acid, the frond is distantly banded with dark, transverse striæ.
Colour a pale red, with purplish shades when quite fresh.
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 occars on the American shore in equal
abundance.
From J. corniculata (tab. nost. CCXXXIV.) which it outwardly
much resembles, J. rubens may, at once, be known by the
B 2