72 LEMANE^E. 



1763. ; Hook. Brit. Flora, ii. p. 322. ; Harvey, in Manual, 

 p. 119. 



Hab. Mountain streams near Ludlow : Dillenius. Angle- 

 sea : Rev. H. Davies. 



" It is now more than ten years since I observed, for the 

 first time, this species, and I have named it after the very 

 peculiar form and remarkable curvature of its filaments, Le- 

 mania incurvata. I believe that so very characteristic a 

 name ought to be maintained; that which other botanists 

 have since given to this plant applies equally to two orders 

 of Conferva. 



66 The Lemania incurvata abounds in certain rivers ; I have 

 above all observed it in the Dordogne, near the little town of 

 Sainte Foix. The fishermen bring it up from the bottom of 

 the river in their large nets. It has been confounded with 

 the following species, even by Linnaeus himself; the figures 

 47 and 48, given by Dillenius, and that of Vaillant, referred 

 to alike indifferently by their authors, prove this. 



" From a little horny disc, fixed to the hard bodies which 

 support it, arise from six to thirty filaments, from one inch 

 to two inches and a half in length, curved in one direction, 

 perhaps by the continual action of the current, to which their 

 rigidity opposes itself in vain. Their colour is of a brownish 

 or reddish green, obscure or livid. They acquire in diameter 

 the greatest dimensions of all the Conferva. 



" The joints are ovoid and thinned (amincies) at their point 

 of contact, while, in the following species, the contrary is 

 always observed. The Lemania incurvata is moreover shorter 

 and thicker, and the filaments but rarely branched." Bory. 



2. LEMANIA FLUVIATILIS Ag. 

 Char. Frond ramose. Inflations subdistant, oblong. 



Lemania (corallina) filamentis subsimplicibus, articulis ob- 

 longtSy extremitatibusturgidis, vol.xii. pi. xxi. fig. 2.; Bory, 

 in Annales du Musee. Chantransia (Jluviatilis) viridi- 

 nigrescens ; Jilamentis subdivisis, cartilagineis ; articulis 

 teretibuSj geniculis tumidis, Cand. Syn. 10. Chantransie 



