CONFERVA RUPESTRIS. 



C. filamentis ramofiffimis fafciculatis ftriftis virgatis adpreffis, apice 

 truncatis : diffepimemis paruin comra&is, cryftallinis ; articulis 

 longis, cylindricis. 



C. rupeftris. Sp. PI. p. 1637. Fl. Ang. p. 601. Fl. Scot. p. 994. With, 

 rV. p. 140. Fl. Dan. t. 948. Roth, Cat. Bot. II. p. 208. Fl. Germ. III. 

 pars 1. p. 516. 



C. glauca. Roth, Cat. Bot. II. p. 208. t. 6. 



C. marina trichodes ramofior. Dill. Hid. Mufc. p. 28. t. 5. f. 20. 



C. marina trichodes f. mufcus marinus virens tenuifolius. Ray. Syn. p. 60. 



On Rocks and Stones in the Sea, common. 



THIS elegant fpecies, one of the moft common ornaments of our fhores 

 appears to have been longer and better known than moft of the Conferva;. Its 

 root, a fmall callus, gives rife to a number of dark green filaments, fomewhat 

 rigid to the touch, which are fo repeatedly branched, that each of them aflumes 

 a bufhy appearance; the mode of ramification is irregular, fome of the branches 

 being alternate, and fome oppofite ; while, towards the fummit, three or four are 

 frequently difpofed without interruption on the fame fide. — All of them areerefl, 

 and remarkable for their ftraitnefs, as well as for being placed very clofe to each 

 other : the ends are always blunt, and generally fo much fo as to have a truncated 

 appearance ; but in fome fpecimens, this is more ftrikingly the cafe than in others. 

 On this, and other fmall variations, to which this plant is liable, Dr. Roth, 

 who does not appear ever to have had an opportunity of examining it when 

 frefh, has founded another fpecies under the name of C. glauca, which, upon the 



