CONFERVA ACHARII. 



C. filamentis ramofis, csefpitofis, rigidiufculis, fub-ereais, fragilibus, 

 fufco-olivaceis; ramis brevibus, patentibus, apicibus obtufis j articu- 

 lis Iongiufculis. 



C. Acharii. Weber & Mohr, reife durch Sehweden, p. 104. t. 1. f. 6. Roth. 

 Cat. Bot. III. p. 298. 



Parmelia velutina. Acharius Methodus Lichenum. II. p. 24?. 



On fhady Banks in the neighbourhood of Norwich, not uncommon. W. J. 



Hooker, Efq. 



WE are indebted to Mr. Hooker for the prefent addition to the Britifh Flora, 

 he having difcovered it growing plentifully among the mofs on fhady banks in 

 the neighbourhood of Norwich, and by comparing it with authentic fpecimens 

 proved that it is the C. Acharii of the above mentioned German authors. It 

 forms ftrata feveral inches in circumference of an olive brown color, by which it 

 may be at once diftinguifhed from C. velutina, which it moft refembles in its 

 mode and place of growth. The filaments grow nearly ere£r, and matted to- 

 gether ; their nature is rather brittle, and each has rarely more than one branch, 

 which is fhort, patent and very obtufe. The length of the joints is nearly 

 equal to double the diameter. The fructification has not been difcovered. 



C. Acharii may be diftinguifhed from C. othotrichi by its far different color; 

 by its place and mode of growth ; by its filaments which are much lefs branched, 

 and by its fhorter joints. 



In drying it adheres to neither Glafs or Paper. 



A. C. Acharii, natural fize. 



B. Ditto, magnified 3. 



C. Ditto, ditto 1. 

 16 



