CRYPTOGAMIA ALGJE. 803 



numerous crowded, Imooth, angular warts, of 

 the fame colour as the cruft. Upon the head of 

 each wart are fmall black imprefled pundlures, 

 from one to ten in number, as if made with the 

 point of a pin, under each of which pundures, 

 if the wart be cut tranrverleiy, will be found a 

 hollow fphferical cell. In the old fpecimens the 

 pundures open of themfelves, and difcovcr the 

 cells, 



L. leprofus cinerco-virefc^ns, tuberculis atris. Sp. 

 pi. 1607. (Dillen. mufc. /. 18./. 3.) 



Black nobbed Lichen. Anglh. 



Upon the bark of trees frequent, and upon rocks, 

 and fometimes upon the ground. 



The cruft is afh-colour'd, with a tinge of green. 

 The tubercles are quite black, without glofs, 

 about the fize of a pin's head, convex when 

 old, often nearly globular, and without a mar- 

 gin. Linn^us fays, that when broken they jire 

 red within. We have fometimes found them fo 

 when growing upon rocks, but this is by no means 

 a certain mark of diitindion. 



The ground of this, when found on rocks, is 

 rough, not fmooth,^ and teflellated like the fol- 

 lowing. 



"MkaTcus yl L. leprofus candidus, tuberculis atris. Sp. pi. 1607. 

 (Dilien. mufc. t. iS.f. 8.) 

 Black- nobb'd Dyer's Lichen. J^glis, 



F f f 2 Upon 



