Ser. RuoposPERMEA. Fam. Rhodomelee. 
Prats CXLVI. 
POLYSIPHONIA ELONGELLA, Zar. 
Grn. Cuan. Frond filamentous, partially or generally articulate ; joints 
longitudinally striate, composed of numerous radiating cells or tubes 
disposed round a central cavity. Lructification two-fold, on different 
individuals; 1, ovate capsules (ceramidia), furnished with a terminal 
pore, and containing a mass of pear-shaped spores; 2, ¢e¢raspores 
imbedded in swollen branchlets. PotystpHonta (G'rev.),— from 
Tohus, many, and sipor, a tube. 
Potystenonta elongella ; filaments setaceous and rigid below, gradually 
attenuated upwards, irregularly dichotomous, with very patent axils ; 
upper branches flaccid, more or less furnished with lateral, pencilled, 
multifid, rose or blood-red ramuli; articulations of the branches about 
as long as broad, those of the ramuli rather longer, both marked with 
2-3 broad, parallel, oblong cells; primary tubes four, surrounding a 
minute cavity, and encompassed with an external coat of small cells ; 
capsules ovate, on a short stalk ; dissepiments pellucid. 
PotysiPHonia elongella, Harv. in Hook. Br. Fl. vol. ii. p. 334. Harv. Man. 
p.96. Wyatt, Alg. Damn. no. 84. J. Ag. Alg. Medit. p.135. Endl. 3rd Suppl. 
p. 45. (n. 30). 
Has. On rocks and stones, and on the smaller Alge, near low-water mark 
and ata greater depth. Biennial. Spring and Summer. Rather 
rare. Sidmouth and Torbay, Mrs. Griffiths and Miss Cutler. Devon- 
port, Rev. W. 8. Hore. Jersey, Miss. H. M. White. Orkney, Rev. 
J. H. Polleafen. Ardrossan, Rev. D. Landsborough. Dublin Bay, 
Miss Ball. WUowth, Miss. Gower. Kalliney, Mrs. Apjohn. Belfast 
Bay, Dr. Drummond and Mr. Thompson. Larne, Mr. D. Moore. 
Malahide, Mr. M? Calla. 
Geoer. Distr. Coast of France, Lenormand. Adriatic Sea, J. Agardh. 
Descr. Fronds from two to four or five inches high, solitary or slightly tufted: 
as thick as hogs’ bristle below, cartilaginous and firm, gradually attenuated 
and becoming flaccid and tender upwards, divaricately or very patently 
branched, more or less regularly dichotomous, the axils, especially the lower 
ones, very wide and obtuse. Upper branches elongate, flexuous, alternately 
divided, and furnished with lateral, multifid, pencilled ramuli, which are 
more or less dense on different specimens. These ramuli are excessively 
tender and flaccid, and of a more or less intense sanguineous-red : late in 
the season they fall away, leaving naked spine-like branchlets. Articulations 
clearly visible in all parts of the frond, the dissepiments being pellucid ; 
lower articulations shorter than their breadth, those of the branches about 
equal in length and breadth, those of the ramuli rather longer, but rapidly 
diminishing toward the apices. A transverse section of the lower part of 
the stem shows four large primary tubes, arranged in a cruciform manner 
round a minute central cavity, and surrounded by two or three rows of cells, 
gradually smaller outwards ; a section of a branch has four similar primary 
