Ser. RHoposPpERME. Kam. Rhodomelea. 
Prats CCCIL.: 
POLYSIPHONIA FIBRILLOSA, Gre. 
Gey. Cuar. Frond filamentous, partially or generally articulate ; articula- 
tions longitudinally striate, composed of numerous, radiating cells or 
tubes, disposed round a central cavity. ructification twofold, on 
different individuals: 1, ovate capsules (ceramidia) furnished with a 
terminal pore, and containing a tuft of pear-shaped spores ; 2, ¢etra- 
spores, wnbedded in swollen branchlets. PoLysrpHonia (Grev.),— 
Torus, many, and oper, a tube. ' 
PotysteHonta fibrillosa; pale straw-colour or brownish; stems inarti- 
culate, opake, with sinuous veins, robust, alternately branched ; 
branches spreading, resembling the stem, but less opake, articulated 
towards the apices, subsimple, thickly set with very slender, articu- 
lated, finely divided, short ramuli, whose tips are copiously fibrill- 
ferous; articulations of the ramuli rather longer than broad, 2—-3- 
striate ; siphons four, in the stem surrounded by a thick wall of 
small cells ; capsules broadly ovate ; tetraspores large, in distorted 
terminal ramuli. 
’ PotystpHonta fibrillosa, Grev.—Harv. in Hook. Br. Fl. vol. ii. p.334. Harv. . 
Man. ed.2. p.87. Wyatt, Alg. Danm. no. 136. Endl. 3rd Suppl. p. 46. 
J. Ag. Alg. Medit. p.138.  Kaitz. Sp. Alg. p. 827.  Kiitz. Phyc. Gen. 
p- 427. 
Hurcursta fibrillosa, 4g. Sp. d/g. vol. ii. p. 78.  Lyngb. Hyd. Dan. p. 113. 
Hurcuinsta lubrica, 4g. /.c. p. 94 (fide J. Ag.) 
Hurcuinsta pilosa, Nace. (fide J. Ag.) 
ConFervVa fibrillosa, Dill. / Syn. p. 86. t. G. 
Has. On rocks and stones, and on A/ge, chiefly in clear, sunny pools left 
by the falling tide. Annual., Summer. frequent on the British 
coasts. 
Geogr. Distr. Atlantic shores of Europe. Baltic and Mediterranean Seas. 
Descr. Root a small disc. Fronds solitary or tufted, not densely aggregated, 
from six to eight or ten inches in length, often twice the diameter of hog’s 
bristle in the lower part, attenuated upwards; sometimes of half these 
dimensions or less. Séem either undivided, running through the frond, or 
once or twice parted into a few principal branches, naked for a short way 
above the base, then furnished with closely-placed lateral branches for the 
whole remaining length. Branches widely spreading or horizontal, robust 
like the stem, the lowermost longest, the rest gradually shorter, repeatedly 
and decompoundly branched alternately, each younger set of branches more 
slender than the rest, till the ultimate divisions are finer than hair. In 
large and old specimens the series of lesser branches are sometimes as many 
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