Ser. RuoposperME. Fam. Rhodomelea. 
Pruate CCXCILI. 
POLYSIPHONIA ELONGATA, Grev. 
Gey. Cuar. Frond filamentous, partially or generally articulate; joints 
longitudinally striate, composed of numerous radiating cells or tubes, 
disposed round a central cavity. Fructification twofold, on different 
individuals; 1, ovate capsules (ceramidia) furnished with a terminal 
pore, and containing a tuft of pear-shaped spores; 2, ¢etraspores, 
imbedded in swollen branchlets. Potystrpnonta (Grev.),—from 
modus, many, and ouper, a tube. 
PotysteHonta elongata; stems robust, cartilaginous (rarely gelatinous), 
irregularly branched, beset, especially towards the tips, with slender, 
close-set, multifid ramuli, which are attenuate to the base and apex ; 
articulations about as long as broad (the upper ones rarely once and 
half to twice as long), those of the stem reticulated with veins and 
more or less obsolete. 
PoLysrPHoniA elongata, Harv. in Hook. Br. Fl. vol. ii. p. 333. Wyatt, Alg. 
Danm.no.40. Harv. in Mack. Fl. Hib. part 3. p. 209. Harv. Man, ed. 2. 
p. 86. J. dg. dig. p.136. Endl. 3rd Suppl. p. 45. Kiitz. Phyc. Gen. p. 428. 
Sp. Alg. p. 828. 
PotysipHonta Ruchingeri, J. 4g./ Alg. Medit.p.136. Kg.! Phyc. Gen. 
p- 428. Kg. / Syst. Alg. p. 829. 
PotysrPHonta rosea, Grev./ Fl. Edin. p. 
PoLysrPHonta stenocarpa, Ky. Sp. Alg. p. 830. (fide sp. a Zanard.) 
PotysrPHonta chalarophlea, Ky. / Sp. Alg. p. 831. 
PotysipHonta clavigera, Kg. Sp. Alg. p. 831. (fide sp. a Zanard.) 
Se elongata, 4y. Syn. p.54. Hook. Scot. part 2. p.87. Ag. Syst. 
p. 152. 
Hurcurns1a Ruchingeri, 49. Sp. Alg. vol. ui. p. 86. 
Crramium elongatum, Roth, Cat. Bot. vol. iii. p. 128. 4g. Disp. p. 19. 
Lyngb. Hyd. Dan. p.117.+.66.D.1.  Grev. Fl. Edin. p. 310. 
Crramium brachygonium, Lyng. Hyd. Dan. p. 118. t. 36. 
Conrerva elongata, Huds. Fl. Angl. vol. ii. p. 599. Dillw. Conf. t. 33. and 
suppl. t.G. #. Bot. t. 2429. 
Has. Common on stones and shells, in pools between tide-marks, and 
attached to oyster and scallop shells, &c., in 5-10 fathoms water. 
Perennial, or at least biennial. Spring and summer. 
Groer. Distr. Atlantic and Mediterranean shores of Europe. North America. 
Descr. Root asmalldise. Fronds solitary, or a few together, but scarcely tufted, 
from six to twelve inches high, robust, varying in diameter from the thick- 
ness of hog’s bristle to that of the antenna of a lobster, rising with an un- 
