48 ACOTYLEDONS. LICHENS. Lecanorct. 



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



4. L. ventosa, 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. Lich.p. 159. Lichen ventosus, Lightf* 

 p. 80(5. E. B. t. 906. 



HAB. Rocks upon the mountains, common. 



5. L. frustulosa, crust tartareous very much cracked variegated 

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

 Sm.) y apothecia pale brown at length convex dark brown, mar- 

 gin white. Ach. Syn. Lich.p. 159. E. B.t. 2273 (Lichen 



frustul.). 



HAB. Rocks in Scotland, Dickson. On Ben Lawerc, Mr. Borrer 

 and Hook. 



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

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

 Lic/i. p. 180. Lichen ochrol., E. B. 1. 1373. 



HAB. Mountains of Scotland, upon the ground. 



ftt Disk 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 obliterated. Ach. Syn. Lich. p. 165. Lichen Glau- 

 coma, E. B.t. 21 56. L.rupicola, Lightf.p.SOQ. 



HAB. On rocks, not unfrequent. At the fall of Fyers, Mr. Turner 

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



tftt Disk of the apothecia somewhat flesh-coloured, pale, testaceous, 

 yellowish or orange. 



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

 apothecia thick crowded by pressure angular, the disk concave 

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

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

 *.726. Lightf.p.Sl4. 



|3. upsaliensis 9 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* 

 1. 169. 



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

 stones, at Helensburgh, common, Hopk. /?. 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 in lieu of the L. tartarea, Perelle d'Auvergne, 

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

 led Parellus. L. Turner i is probably only a var. growing upon the 

 bark of trees. 



