48 AcaxYLEDON!?. — LICHENS. Lecanora. 



Hab. Trunks of trees, walls and rocks, common. 



4. L. veiitosa, crust tessellated with tumid warts yellow green 

 or grey, apothecia appressed at length irregular with the disk 

 plane or swelling red brown at length rising above the entire 

 margin. Ach. Syn. Lick. p. 159. Lichen vent osus, Liglitf. 

 p. 80(5. E. J5. /.906. 



Hab. Rocks upon the mountains, coravuon. 



5. h. fruslulosa, crust tartareous very much cracked variegated 

 with black and white (yellowish white in dispersed tumid warts, 

 .St?;.), apothecia pale brown at length convex dark brown, mar- 

 gin white. Ach. Syn. Lic/i.p. \b9. E. B.t. 227S {Lichen 



Jrusli/L). 

 Hab. Rocks in Scotland, Dickson. On Ben Laners, Mr. Boner 

 and Hook. 



6. L. ochroleuca, crust thin leprose white, apothecia crowded 

 elevated, disk plane olive, the margin waved. Ach. Syn. 

 Lich. p. 180. Lichen ochroL, E. B. t. 1373. 



Hab. Mountains of Scotland, upon the ground. 



ft f H'lsk of the apothecia black, but covered with a powdery substance 



or bloom. 



7. L. Glaucoma, crust tartareous tessellated even greyish white, 

 apothecia immersed in the crust, the disk plane at length con- 

 vex subglobose glaucous and powdery, margin entire after- 

 wards obhterated. Ach. Syn. Lich. p. 165. Lichen Glau- 

 coma, E. B.t.2\o6. L. rupicola. Light/, p. S06. 



Hab. On rocks, not unfrequent. At the f:xll of Fyers, Mr. Turner 

 and Hook. On slate and whin stones, on Campsie hills, Hopk. 



ffft Disk of the apothecia somewhat Jlesh-coloured, pale, testaceous, 

 yellowish or orange. 



S. L. Perellus, crust granulated or somewhat warted white, 

 apotheci;i thick crowded by pressure angular, the disk concave 

 and as well as the tumid entire margin of the game colour as 

 the crust. Ach. Syn. Lich. p. 169. Lichen Perellus, E. B. 

 t.726. Light/, p. S{4. 



/3. upsaliensis, crust very thin membranaceous smooth glaucous 

 white bearing awl-shaped bristles, disk of the apothecia at 

 length spreading plane pale yellowish. L. upsaliensis, E. B. 

 t. 169. 



Hab. Stones and rocks in exposed situations, frequent. Walls and 

 stones, at Helensburgh, common, Hopk. /3. Not uncommon on 

 the ground, and covering grass and mosses. 



Affords a purple or crimson dye, and called in the south of France, 

 where it is employed iu lieu of the L. tartar ea, Perelle d'Auvergne, 

 whence the specific name, as Smith tells us, though generally spel- 

 led P^reZ/iw. L. Turneri is probably only a var, growing upon the 

 bark of trees. 



