CONFERVA FLUVIATILIS. 



C. filamentis ramofis rigidiufculis ; ramis ramulifque fubalternis utrinque 

 attenuatis j diflepimentis torofis, verrucofis ; articulis longis bifariam 

 dilatatis. 



C. fluviatilis. Sp. Plant, p. 1635. Fl. Ang. p. 597. Scot. p. 985. With IV. 

 p. 134. Roth. Cat. Bot. I. p. 201. Fl. Germ. III. pars 1. p. 528. 



C. torulofa. Roth. Cat. Bot. I. p. 202. Fl. Germ. III. pars 1. p. 529. 



C. fluviatilis nodofa, fucum oemulans. Dill. Mufc. p. 37. t. 7. f. 4. 8. 



C. fluviatilis lubrica, fetofa, equifeti facie. Dill. Mufc. p. 39. t. 7. f. 47. 



In rapid and rocky ftreams, in Yorkfhire, Cumberland, and Weftmoreland, 

 Hudfon. Common in the Weftern counties of England and in Wales. 



C. FLUVIATILIS abounds in mod of the rapid rivulets in Wales, and the 

 Weft of England, growing in large mafles, generally of a dull olive color, but fome- 

 times varying to a greenifh purple. The root is a fmall callus, common to feveral 

 filaments, which are fix or eight inches long, irregularly divided and fub-divided 

 into branches and ramuli attenuated at both ends. The principal branches are 

 about the thicknefs of common twine ; but the ultimate ramuli are often as fine 

 as the hair of the human head. Sometimes however its filaments are nearly fimple, 

 when they are {horter, thicker, and more rigid than thofe which are much 

 branched. In this ftate it is moft probably die C. fluviatilis nodofa, fucum smulans 

 of Dillenius, and the C. torulofa of Dr. Roth ; but, as I have obferved both ap- 

 pearances on filaments growing from one root, I cannot confider them as diftinft 

 fpecies. The difiepiments are fwollen, fo as to appear very evident to the naked 

 eye, and are generally befet with two, three, or fometimes four hairy tubercles, 

 which are perhaps in fome manner connected with the fructification, though 

 no feeds have hitherto been detected in them. 



