Ser. RuoposPERMEA. Fam. Spherococcoidee. 
Prats CLXXV. 
RHODYMENIA JUBATA, Grev. 
Gen. Car. Frond flat, membranaceous or subcoriaceous, ribless, veinless, 
cellular; central cells of small size; those of the surface minute. 
ructification of two kinds, on distinct individuals ; 1, convex tubercles 
(coccidia) having a thick, cellular pericarp, contaiming a mass of minute 
spores on a central placenta. 2, ¢e¢raspores, either zoned or triparted, 
imbedded among the cells of the surface, scattered, or forming cloudy 
patches. RuopymeEnta (Grev.),—from podeos, red, and vpny, a mem- 
brane. 
Ruopymenta jubata; frond thickish, flaccid, subcartilagmous, dull-red, 
hnear-lanceolate, much attenuated or cirrhose at the apex, vaguely 
pinnate with lneinigs of the same form; the margins, and often the 
disk, beset with subulate or filiform cilia, in which both tubercles 
and tetraspores are produced on distinct plants; root fibrous, 
branching. 
RHODYMENIA jubata, Grev. Alg. Brit. p. 91. Hook. Br. Fl. vol. ii. p. 291. 
Wyatt, Alg. Danm. no. 18. Harv. in Mack. Fl. Hib. part 3, p. 194. Harv. 
Man. p.63. J. Ag. Alg. Medit. p.153. Endl. 3rd Suppl. p. 51. 
CaLLIBLEPHARIS jubata, Ky. Phyc. Gen. p. 404. 
SpH#Rococcus jubatus, Grev. Scot. Crypt. t. 359. 
SpH#£Rococcuws ciliatus, vars. jubatus, linearis, angustus, and spinosus, 4g. 
Sp. Alg. vol.i. p. 264. Ag. Syst. p. 221. 
Fucws jubatus, Good. and Wood. Lin. Trans. vol. iii. p. 162. t. 17. Stack. 
Ner. Brit. p. 51. t. 11. 
Fucus ciliatus, vars. jubatus, lanceolatus, angustus, and spinosus, Turn. Hist. 
t. 10. fig. fz. 
Has. On the bottoms of rock-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. 
Groer. Distr. Atlantic shores of Europe. Mediterranean Sea. 
Descr. Root composed of densely matted, branching fibres. Fronds densely 
tufted, very variable in form. They all rise with a cylindrical stem which 
is from one to five or six inches in length, becoming gradually wider and 
~ more compressed upwards and expanding into a flat, linear-lanceolate, very 
narrow, simple or forked frond, which is much drawn out at the apex, and 
more or less regularly pinnate with lacinie resembling itself. These pinne 
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 Algz in a very entangled manner. Sometimes the 
whole frond is cylindrical, much and irregularly branched ; the branches 
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