CONFERVA ATRO-VIRENS. 



C. filamentis rigidiufculis raraofis ; ramis divaricatis, fub - fecundis, 

 utrinque attenuatis, apicibus obtufiufculis ; diffepimentis pellucidis; 

 articulis breviilimis tripunctatis. 



On the wet Rocks, forming the banks to the Dylais River, near Neath. 



THIS lingular, and hitherto unobferved fpecies, abounds on the dripping 

 rocks which conftitute the banks of the River Dylais, near where it forms the 

 romantic cafcade, fo well known to thofe who have vifited the highly pidurefque 

 neighbourhood of Neath, in Glamorganfhire. It grows in thick bufhy tufts, of 

 a blackifh green color ; and from its rigid nature, is liable at firft fight to be 

 miftaken for one of the Mufci, with which it is not unfrequently mixed. The 

 root appears to be a very minute callus. The filaments, from a quarter to half 

 an inch in length, are divided into numerous branches, which are difpofed with- 

 out any apparent order, though feveral together are moftly on the fame fide of 

 the main Item, with which they form a very obtufe angle: they taper in fome 

 degree both towards their origin and apex, but terminate rather bluntly. The 

 diffepiments are pellucid : the joints very fhort, not much exceeding the diflepi- 

 ments in length, and as it appears under the microfcope, compofed of three 

 granules, which, not having been able to find any other, I conclude are the 

 fructification of the plant. 



There is no danger of its being confounded with any other fpecies. 

 When dried its color becomes rather darker, and in that ftate it will not 

 adhere to glafs or paper. 



A. C. atro-virens, natural fize. 

 B- Ditto magnified 3. 



C. Ditto ,. 



