POLYSIPHONIA. 85 



known beyond a single specimen preserved in the Hookerian Herbarium, 

 and figured in Phycologia Britannica, as above quoted. 



8. P. Griffithsiann, Harv. ; stem rigid, attenuated, alter- 

 nately branched ; branches long, patent, sub-sixnple, furnished 

 with numerous sub-dichotomous or alternate, slender, patent, 

 flaccid ramuli ; articulations of stem, branches and ramuli, 

 about once and a half as long as broad, with straight 

 veins ; capsules broadly ovate, sessile. Harv. Pliyc. Brit. t. 

 ccxxviii. 



Parasitical on Polyides rotundus at Torquay, Mrs. Griffiths. Isle of 

 Portland, Miss White. Annual. Summer. Very rare. — Stems 3 or 

 4 inches high, as thick as a bristle, gradually attenuated upwards, altei-- 

 nately branched, the branches long, pateut, simple or divided, furnished 

 with numerous, sub-dichotomous or alternately divided, slender, patent 

 ramuli, the ultimate ones often recurved, having a feathery character. 

 Articulations of the stem visible to the base ; they, as well as those 

 of the branches and ramuli, about once and a half as long as broad, 

 usually equal in all parts of the plant. Substance rather rigid in 

 the stem and branches, imperfectly adhering to paper, flaccid in the ra- 

 muli, not decomposing, nor giving out colour in fresh water. Colour, 

 below brownish, above rosy or pink. Nearly allied to P. Richardsoni, but 

 in Mrs. Griffiths' opinion distinct. It is chiefly remarkable for the equaliti/ 

 of its short joints, and for its property of resisting fresh water; "though 

 kept long in Iresh water it gave out neither colour nor smell, nor did it de- 

 compose as others would in the time.'' 3frs. Griffiths in litt. 



9. P. elongella, Harv. ; stems setaceous, rigid, sub-dicho- 

 tomous ; branches very patent, beset with flaccid, somewhat 

 tufted, elongated, multifid ramuli, not tapering at base; joints 

 of the branches about as long as broad, those of the ramuli 

 rather longer, both marked with three parallel veins ; disse- 

 piments pellucid. Harv. in Hook. Br. Fl. ii. p. 334 ; Wyatt, 

 Alg. Damn. No. 84 ; Harv. Phyc. Brit. t. cxlvi. 



On rocks, &c., between tide-marks. Biennial. Spring. Rather rare ; 

 but generally distributed round the British shores. — Stems 2 — 4 inches 

 high, in the lower part rigid, cartilaginous, and as thick as hogs' bristles, 

 attenuated upwards to a capillary fineness ; main branches distant, very pa- 

 tent or divaricated; ramuli more or less crowded, sometimes densely tufted, 

 straight, dichotomous, somewhat tapering to the apex, not at all contracted 

 at the base. Articulations distinctly visible in all the main branches, 

 obscure towards the root ; veins all parallel. Colour of the stems brown- 

 ish, of the ramuli rose-red. Ceramidia large, ovate, scattered on the ra- 

 muli. This closely resembles small specimens of P. elongata, but is easily 

 and clearly distinguished by the distinctly jointed branches, and the paral- 

 lel (not reticulated) veins which they contain. It probably undergoes simi- 



lar changes. 



