38 ACOTYLEDONS. LICHENS. LecidccC. 



sessile plane at length convex irregular confluent black in- 

 ternally corneous and black. Ach. Syn. Lick. p. 22. E. B. 

 t.WlS {Lichen siloceus). 

 Hab. Rocks on Ben Nevis, Mr. Turner and Hook. 



10. L. CEdcri, crust granulated and tessellated somewhat pul- 

 verulent ochraceous red, apothecia minute elevated with the 

 margin tumid, the disk depressed black nearly of the same 

 colour internally. Ach. Sijn. Lich. p. 22. E. B. t. 1117 

 {Lichen CEd.). 



Hab. Rocks in Scotland, Dickson. On Ben Nevis, Mr. Turner and 

 Hook. 



1 1 . L. olba, crust membranaceous white with a greyish or whitish 

 grey povvdery substance scattered over it in small clusters, 

 apothecia minute appressed plane black. Ach. Syn. Lich. 

 p. 24. Leprnria alva^ E. B. t. 1349. Byssus lacleuj Light/', 

 p. 1007. 



Hab. On the bark of old trees and rocks, common. 

 I have never seen the apothecia, described by Acharius, on this species, 

 ft Apotliccia black with a grey bloom. 



12. L. alho-cceridesceiis, crust tartarcous contiguous even at 

 length somewhat tessellated and whitish, apothecia sessile and 

 elevated plane black with a grey bloom and a black smooth 

 border. Ach. Syii. Lich. p. 30. E. B. t. 2224 {Lichen prui- 

 nosns) . 



Hab. Scotch Alps, Dickson. 



13. L. epipolia, crust tartareous defined tessellated white, areolae 

 swelling, apothecia sessile hemisphserical with a grey bloom 

 black within with a thin persistent margin. Ach. Sy7i. Lich. 

 p. 32. E. B. t. 1137 {Lichen epip.). 



Hab. Scotch Alps, Dickson. 



ttt Apothecia orange, red, Jlesh-colour, or more or less brown. 



14. L. incann^ crust spreading leproso-farinose soft uneven 

 glaucous green, apothecia scattered sessile brown with the 

 margin entire paler. Jlch.. Syn. Lich. p. 36.* E. B.l. 1685 

 {Lichen incanus). Byssus incana. Light/', p. 1006. 



Hab. "Woods, trunks of trees, and amongst moss, frequent. Light/., 



Hopk. 

 The apothecia, which are published no where but in Engl. Bot., are of 



estremelv rare occurrence, and, till their discoveiy, the plant was 



arranged among the Leprarice by Acharius. 



15. L. sulphured, crust tartareous cracked and broken uneven 

 smoothish pale sulphur colour, apothecia adnate plane scarcely 

 margined brown and scarcely paler in the margin at length ir- 

 regular and convex. Ach. Syn. Lich. p. 37. E. B. t. 1186 

 {Lichen sulph.). 



Hab. Rocks in Scotland, Dickson. On Ben Lomond, Mr. Turner 

 and Hook. Walls and rocks about Helerisburgh, Hopk. 



