CEB LM1 \<j; B. Ill 



but are of equal diameter throughout. From G.cara 

 which in many respects it resembles, its cylindrical articu- 

 lations and different inflorescence distinguish it. 



246. setacea (The bristly Chriffithsid) \ filaments 

 straight, rigid, dichotomous, or Bub-dichotoraous ; axils verj 

 acute; Lesser branches sometimes opposite, attenuated to a 

 point, erect; articulations cylindrical, five or sii times 



ger than broad : involucres (of both kind-) pedunculate, 

 lateral, Ag. Syn. p. 28. (Atlas, PL LV. Fig. 253.) 

 Conferva setacea, Ellis. 



Huh. On the perpendicular Bides of deep rock-pools, near low- 

 water mark, under the Bhade of larger Algse. Perennial. 

 Fruiting in Bpring and Bummer. 

 A long-known and beautiful plant, found on all the 

 British shores, and widely dispersed through the ocean. 

 When quite fresh it is remarkably crisp and firm in sub- 

 Btance, the points of its filaments standing firmly out 

 when the tuft is removed from the water. Bui it very 

 rapidly becomes flaccid, and if dropped into fresh water, 

 the membranous walls of its filaments hurst asunder with 

 violence, and with a sharp crackling noise, discharging tie' 

 contents of the cells into the water. These form a line 

 powder of a brilliant carmine-colour, and might, no doubt, 

 be used as a pigment if the plant could he collected in 

 sufficient quantity. Paper stained with this powder retains 

 its brilliancy of colour in the herbarium for many years. 

 These remarks however apply equally to other Bpecies vi 

 the genus. 



LXXXV. WBANGKELIA. 



247. multifida (The many-slit Wrangelia)\ >tems Betaceous, 



pinnate or hipmnate, articulated, each joint bearing a pair 



of opposite, slender, pinnato-multifid, incurved ramuli, or 

 whorledwith numerous Bub-dichotomous ramuli; joints of 

 the stem many time- Longer than broad, </. Ay. Alg. Medit. 

 P . 7<>. (A rus, PI. UV. Fig. 248.) 



Griffithsia multifida, Ay. Callithamnion multifidnm, Ktz. < 

 ramium yerticillatum, Ducluz. C. Caeuarinse, D( 

 multifida, Huds. 



Ii<ih. Frequent on the southern Bhores of England; and west of 

 Inland, (hi the perpendicular Bides <»t deep marine | 

 near low-watt r mark, under t lie Bhade of other .V 

 Tin' genus Wranyelia, t<> which. follow m, r the recent 

 mger Agardh, 1 remove this plant, was 



