for believing that the fructification refembles that of my* C. frigida figured at 

 Plate 1 6, but I have not been able to difcover it. 



C. umbrofa of Roth, figured at Plate 61 of this work, differs from C. velutina 

 in its much darker color and more brittle nature. I however ftrongly fufv/ccl: 

 that it is a variety only of this fpecies occafioned by its growth in a colder and 

 boggy foil. The Conferva introduced by Dr. Roth ia his Catalecta and Flor.j 

 Germanica under this name, is an entirely different fpecies, and is the C. violacea 

 of Hudfon and C. confragofa of the Flora Scotica. 



In drying C. velutina adheres to both Glafs and Paper. 



A. Co velutina, natural fize. 



B. Ditto magnified i. 



* I may take this opportunity to obferve that the plant which I have figured under that name is not 

 the C. frigida of Roth. Drs. Mohr and Weber, in their German edition of this work, firft corrected 

 the error, and their correction is confirmed by the 3d vol. of the Catalecta Botanica lately publifhed. 

 The fpecies which I erroneoufly figured under that name is there defcribed with the name of 

 Ceramium Dillwynii. 



