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■Reeve,BenKam. & 'Reevp, im^
Ser. R h o d o s p e rm eæ . R™- Sp/iarococcoidea.
P l a t e CLXXV.
RHODYMENIA JUBATA, Grev.
Gen. C h a r . Frond flat, membranaceous or subcoriaceous, ribless, veinless,
cellular; central cells of small size; those of th e surface minute.
Fructification of two kinds, on distinct individuals ; 1, convex tubercles
{coccidia) having a tliick, cellular pericarp, containing a mass of m inute
spores on a central placenta. 2, tetraspores, either zoned or triparted,
imbedded among the ceUs of the surface, scattered, or forming cloudy
patches. R h o d y m e n ia {Orev.),— from poSeos, red, and vggv, a mem-
hrane. ______
R h o d y m e n ia jubata-, frond thickish, flaccid, subcartilaginous, dullfred,
linear-lanceolate, much attenuated or cirrhose at the apex, vaguely
pinnate with laciniæ of th e same form; the margins, and often the
disk, beset with subulate or filiform ciha, in which both tubercles
and tetraspores are produced on distinct plants ; root fibrous,
branching.
R h o d y m e n i a jubata, Grev. Alg. Brit. p. 91. Iloolc. Br. M. vol.ii. p. 391.
Wgatt, Ala. Damn. no. 18. Harv. in Mack. FI. HU), part 3, p. 194, Harv.
Man. p. 63. J. Ag. Alg. Medit. p. 153. Endl. 3rd Sappl. p. 51.
Calliblephams jubata, Kg. Ehge. Gen. p. 404.
Sphærococcus jubatus, Grev. Scot. Crypt, t. 359.
Sphæboooccüs cüiatus, vars. jubatus, Hnearis, angustus, and spinosus, Ag.
Sp. Alg. vol i. p. 264. Ag. Syst. p. 221.
Fucu s jubatus, Good, and Wood. Lin. Trans, vol. iii. p. 163. t. 17. Stack.
Ner. Brit. p. 51. 1 .11.
F u cu s ciliatus, vars. jubatus, lanceolatus, angustus, and spinosus. Turn. Hist.
t. 70. % ./-/* .
H a b . On the bottoms of roek-pools between tide marks, chiefly near low-
water mark; also among the roots of Laminaria digitata.^ Annual.
Fruiting in summer. Frequent on the shores of the British islands
from Orkney to Cornwall, and Jersey.
G e o g k . D i s t r , Atlantic shores of Fmrope. Mediten-anean Sea.
Desck. Boot composed of densely matted, branching fibres. Eronds densely
tufted, very variable in form. They all rise with a cylindrical stem which
is from one to five or six inches in leng-th, becoming gradually wider and
more compressed upwards and expanding into a flat. Unear-lanceolate, very
narrow, simple or forked frond, wliich is much drawn out at t k apex, and
more or less regularly pinnate with laciniæ resembling itself, i h e f pinnæ
are often secund ; and often very irregularly placed. Their margins and
disk are more or less densely clothed with filiform cilia from 1-2 lines to
an inch or more in length, branching or simple ; in some varieties produced
into cirrhi 3-6 inches long or more, which clasp round each other and
round neighbouring Algæ in a very entangled manner. Sometimes the
whole frond is cylindrical, much and irregularly branched ; the brandies
4-1.
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