CRYPTOGAMIA ALGJE. 805 



The criifl of this is compofed of black and white 

 lubercks, fo equally mixed that it is difficult to 

 fay which are moil predominant. The black tu^ 

 bercles have often flat heads, and are fome- 

 times finuated on the margin. It is nearly re- 

 lated to the L. calcareus. 



L. leprofus coerulefcens, tuberculis nigricantibus. 

 {Dillen, mufc. t. 82./. 2.) 



Bluifh Lichen, with black warts. Anglis, 



Upon the Highland rocks, but not common. 



The crufl: of this is granulated, and of a blue-grey 

 colour, befet with numerous black, convex tu- 

 bercles, or warts. It leems to be a diftind fpe- 

 cies, though nearly related to the preceding. 



L. leprofus albidus, tuberciUis fubrotundis ferrugi- 

 neis. Syft, vat. edit. 13. p. 805. L. ferrugineus. 

 Hud/.Fl.Jfig, 444. {DilUn. mufc. t. 18./. 4.; 



Vernal Lichen. Anglis. 



On the bark of trees, and fometimes on walls and 

 rocks. 



There are two varieties of this, both with a thin 

 afh-colour'd or whitifh cruft. The firft has tu- 

 bercles of a brick-duft colour \ the other ful- 

 cous, or brownilh ones, fomewhat foft and gela- 

 iinous, not fo diftin6t as the preceding, but 

 crowded together. Neither have any circular 

 margins. 



Perhaps they may be diriind fpecies. 



L. leprofus 



