WRANGELIA. 169 



round the dissepiments of the branches. Harv. Phyc. Brit, 

 t. ccxiv. ; Hook. Br. Fl. ii. p. 338 ; Wyatt, Alg. Danm. No. 

 89. Conf. corallina, E. Bot. t. 1815. 



On rocks, c., between tide-marks, rather rare. On all our coasls. 

 Stems 2 4 inches high, tender and gelatinous, repeatedly and nearly regu- 

 larly dichotomous, thicker than bristles, sometimes nearly half a line in 

 diameter, jointed, the articulations 2 or 3 times longer than broad, swollen 

 upwards, contracted below, giving the frond the beaded appearance of a 

 coralline. Fruit : minute, densely aggregated tetraspores with wide bor- 

 ders, forming a band or whorl round the joints, near the tips of the 

 branches ; and roundish fa vella, disposed laterally on the ramuli. 



6. G. secundiflora , J. Ag.; filaments ultra- setaceous, some- 

 what gelatinous but firm, irregularly dichotomous, the lesser 

 divisions flabellate ; axils acute ; branchlets fastigiate, ob- 

 tuse, not tapering to a point ; articulations cylindrical, two 

 to four times as long as broad, with a very wide border ; " in- 

 volucres on very short, lateral peduncles." Harv. Phyc. Brit, 

 t. clxxxv. 



On rocks, near low-water mark, veiy rare. Perennial ? Discovered at 

 Bovisand, near Plymouth, by Rev. W.S. Hore. Filaments densely tufted, 

 4 8 inches high, thicker than hogs' bristles, not much attenuated, of a 

 fine, rich crimson-red, repeatedly forked ; all the axils acute, and the 

 branchlets very erect. Apices not tapering. Fruit has not yet been seen 

 in Britain. 



7. G. setacea, Ellis ; filaments dichotomous, setaceous, 

 rigid, straight; the lesser branches sometimes opposite, atte- 

 nuated to a point; axils acute; joints cylindrical, 5 or 6 

 times longer than broad ; involucres, of both kinds peduncu- 

 late, lateral. Hook. Br. Fl. ii. p. 338 ; Wyatt, Alg. Danm. 

 No. 137; Harv. Phyc. Brit. t. clxxxiv. Conf. setacea, E. 

 Bot. t. 1689. 



On rocks, &c. between tide-marks ; not uncommon near low-water mark. 

 Perennial. Stems 3 6 inches long, setaceous, rather rigid, irregularly di- 

 chotomous, jointed; joints cylindrical, 3 6 times longer than broad, either 

 bare of ramuli, or, rarely, throwing out from the joints simple, horizontal, 

 root-like fibres. Colour a fine transparent crimson, which is instantly given 

 out with a crackling noise, occasioned by the bursting of the membrane, on 

 coming in contact with fresh water. It stains paper of a fine carmine, which 

 keeps unaltered for many years in the herbarium. Involucres raised on la- 

 teral, club-shaped stalks, 2 or 3 lines long ; their ramelli simple or forked, 

 bearing on the inner faces, minute, spherical, crowded, tetraspores. Favella 

 mostly binate, likewise^ attached to involucral ramelli, with very wide 

 borders. 



VI. WRANGELIA. Ag. [Plate 23, !>.] 



Frond purplish or rose-red, filamentous, jointed ; filaments 

 single tubed. Fructification : 1, gelatinous receptacles (fa- 



