40 ACOTYLEDONS" LICHENS. Lecidea. 



23. L. marmorea, crust thin greyish white, apothecia somewhat 

 globose at length urceolate white, the disk flesh-coloured, the 

 margin tumid entire. Ach. Syn. Lick. p. 46. jE. B. t. 739 

 (Lichen marm.). 



HAB. Upon the bark of trees, on earth and mosses, Dickson. 



24. L. alabastrina, crust thin smoothish minutely granulated 

 greyish white, apothecia slightly convex entire whitish rose- 

 colour paler at the margin. Ach. Syn. Lick. p. 46. Lichen 

 rosellus, E. B. t. 1651. 



HAB. Received from Scotland by Mr. Turner, v. E. Bot. 



25. L. Ehrhartiana, crust cartilaginous cracked rugoso- plicate 

 granulated white or greenish, apothecia nearly sessile plane at 

 length slightly convex waved unequal clustered pale yellowish. 

 Ach. Syn. Lich. p. 47. Lichen Ehrhartianus, E. B. t. 1 136. 



/3. polytropa, crust subtartareous tessellated pale, apothecia 

 nearly plane with the margin lobed waved clustered at length 

 stibglobose destitute of margin yellowish flesh-colour. Lichen 

 polytropus, E. B. t. 1264. 



HAB. |8. Rocks on the Pentland hills, Maugh. Rocks about N. 

 Queensferry, and upon Ben Lomond, Mr. Turner and Hook. 



26. L. lucida, crust thin leprose powdery soft pale greenish yel- 

 low, apothecia slightly convex pale yellowish, margin obsolete. 

 Ach. Syn. Lich. p. 48. Lichen lucidus, E. B. t. 1550. 



HAB. Rocks above N. Queensferry, Mr. Turner and Hook. 



27- L- luteo-alla, crust thin smoothish white, apothecia crowd- 

 ed at length convex hemispherical margined orange coloured 

 white within. Ach. Syn. Lich. p. 49. Lichen aurantiacus, 

 Lightf. p. 810. Lichen luteo-albus^ E. B. t. 1426. 



'** Thallus crustaceans of some determined figure, or foliaceous (Le- 



pidoma) . 



28. L. vesicularis, crust somewhat imbricated brownish black 

 covered with a greyish powder, lobes entire swelling, apothecia 

 black naked at length hemisphaerical with the margin obsolete. 

 Ach. Syn. Lich. p. 51. Lichen cceruleo-nigricans, Lightf. 

 p. 805. E.R.t. 1139. 



HAB. Upon the Highland rocks, but not common, Lightf. 



29. L. lurida, crust imbricated greenish brown, lobes roundish 

 crenate paler beneath, apothecia plane at length somewhat 

 convex black. Ach. Syn. Lich. p. 51. Lichen luridus, E. B. 

 t. 1329. 



HAB. Scotch Alps, Dickson. 



30. L. scalaris, crust imbricated pale olive green, lobes distinct 

 reniform nearly erect beneath and the margin powdery, apo- 

 thecia plane margined glaucous black. Ach. Syn. Lich. p, 52. 

 Uichen scalaris, E. B. t. 1501. 



HAB. Upon rocks and earth in the Scotch Alps, Dickson, 



