CONFERVA DISSILIENS. 



C. filamentis fimplicibus ftricVis fragilibus, diffepimentis p mim contracts 

 plerumque folutis, articulis brcvibus, in medio aigro-punftatis. 



On Reeds and other aquatic vegetables b a Ditch on Cromlyn Bog, near Swanfea. 



THIS fpecies, which has not I believe been heretofore defcribed, was firft 

 dilcovered by my friend and drafifman, W.W.Young, in the place above referred 

 to, where it grows in great abundance on reeds and other aquatic plants. The 

 manner of its growth is not fo much entangled as in moft of its congeners ; its 

 color is a dark green ; the filaments are remarkably ftraight and fragile ; in length 

 they are moftly from three to fix inches, and in thicknefs lefs than that of human 

 hair. The difTepiments are flightly contracted, and at thefe the filaments break, 

 and the parts often remain connected at one extremity in the fame manner as in 

 C. peftinalis ; the joints are in length about half equal to their thicknefs and on 

 each fide, both towards the diflepiment and edge, are of a light green, whilft 

 the middle is of a darker color, fometimes approaching to black, and this dark 

 part at length becomes nearly round, and moft pellucid at the center. 



C. difliliens appears to be a link in the chain of fubmerfed alga:, tending to 

 conned C. peftinalis with C. nitida, rivukris, lucens and their congeners, from 

 which it before feemed to be widely feparated. The prefent plant nearly 

 approaches the nature and appearance of the latter in many refpecis, whiift it 

 claims an affinity with the former by its fhort joints, and the manner in which 

 the filaments break at the difTepiments. 



