Ser. RHopOSPERME®. Fam. Rhodomelee. 
Pratt CLXX. 
RYTIPHLZA COMPLANATA, 4. 
Gen. Cuar. Frond filiform or compressed, pinnate, transversely striate, 
reticulated ; the axis articulated, composed of a circle of large, tubu- 
lar, elongated cells (sphons), surrounding a central cell ; the periphery 
of several rows of minute, irregular, coloured cellules. Fructification 
of two kinds, on distinct individuals; 1, ovate capsules (ceramidia) 
containing a tuft of pear-shaped spores; 2, ¢e¢raspores, contained in 
minute, lanceolate receptacles (stichidia), ina double row. Ryrreuima 
(4g.),—from puts, a wrinkle, and rows, the bark; because the sur- 
face is transversely wrinkled or striate. 
RytipHi2£a complanata ; frond brown-red, compressed, pinnate, or bi-tri- 
pinnate, the lower pinne short or abortive, the upper long, straight, 
erect, virgate, once or twice compounded ; pinnul subulate, or bifid, 
erect, closely-set ; the axils acute. 
RytTiPHL#a complanata, 4g. Sp. Alg. vol. li. p. 54. J. Ag. in Linn. vol. xv. 
p- 26. J. dg. Alg. Medit. p. 146. Endl. 3rd Suppl. p.48. Harv. Ner. 
Austr. p. 32. 
PoLysIPHONIA cristata, Harv. in Mack. Fl. Hib. part 3. p. 205. Harv. Man. 
p. 85. 
Fucus cristatus, var. y. articulatus, Turn. Hist. t. 23. f- h. 
PLocaMIvM cristatum, Lamour. Ess. p. 50. t. 5. f. 1, 2, 3. 
Has. On the rocky beds of shallow tide-pools, exposed, at low-water, to 
full sunshine, among Corallina officinahs, &c. Perennial? Summer. 
Very rare. Bantry Bay, Miss Hutchins. Caarush Point, Miltown 
Malbay, abundant in one or two tide-pools, but very local, W. H. H. 
(1847). Whitsand Bay, Dr. Jacob. Dredged in Plymouth Sound, 
Rev. W.8. Hore. 
Groer. Distr. Atlantic coasts of France and Spain. Mediterranean Sea. 
South of England and Ireland. Cape of Good Hope. 
Descr. Root, a mass of branched, creeping, and clasping fibres. Fronds densely 
tufted, from two to four inches high, about half a line in breadth, plano- 
compressed, simple, or once forked below, flabellately branched, or more or 
less pinnate, or bi-tri-pinnate above. Lower portion of the stem either 
naked, or set with short subulate or pinnatifid ramuli; upper branches 
pinnate with branchlets, which increase in length and in composition upwards, 
the lowermost being simple, the upper pinnatifid, and the uppermost more 
compound still. All the divisions are strictly alternate and distichous, and 
the whole frond is marked with arching, transverse striew, or dark lines, 
placed at distances of about half the diameter asunder: these indicate the 
joints of the internal axis, seen through the cells of the surface. Ramuli 
subulate, the older ones becoming bifid, and gradually multifid. I have 
seen no fruit on British specimens. Sudstance cartilaginous, not closely 
