LICHENACE^E. 



Nat. syst. ed. 2. p. 426. 



* # * The various Lichens described by M. Fee as characteristic 

 of the different kinds of Cinchona bark are here omitted because 

 I doubt very much whether they are sufficient for the purpose 

 he has applied them to. The characters of the genera and spe- 

 cies here introduced are chiefly borrowed from Sir William 

 Hooker's British Flora. 



VARIOLARIA. 



Thallus crustaceous, membranaceous, adnate, spreading, uni- 

 form. Shield a suborbicular, scutelliform cup, formed of the 

 thallus, filled with a powdery or flocculent substance, which 

 covers an immersed waxy disk containing imbedded thecae. 



1328. V. discoidea Pers. Hooker B. F. ii. 169. V. amara 

 Achar. Synops. 132. Lichen discoideus E. B. t. 1714. Com- 

 mon on the bark of trees, and occasionally on pales, walls and 

 rocks. 



Crust orbicular, somewhat tartareous, thickish, glaucous white sur- 

 rounded by a zonate border of various colours. Shields numerous, flat, 

 with a thick border ; powder snowy white. Whole plant intensely 

 bitter : has been recommended as a remedy for intermittent fevers. 



1329. V. faginea Pers. Hooker B. F. ii. 169 V. communis . 



Achar. syn. 130. Lichen fagineus E. Bot. 1713. Common on 

 the bark of trees especially old Beech and on pales. 



Crust orbicular, somewhat tartareous, thickish, glaucous-white, sur- 

 rounded by a zonate border of various colours. Shields very abundant, 

 convex, with an obsolete border, powder snowy-white. Properties as 

 in the last species. 



PARMELIA. 



Thallus foliaceous, membranaceous or coriaceous, spreading, 

 lobed and stellated, or laciniated, more or less fibrous beneath. 

 Shields (scutellae) orbicular, beneath formed of the thallus, free, 

 fixed only by a central point, the disk concave, coloured, the 

 border formed by the inflexed thallus. 



1330. P. parietina Ach. syn. 200. Hooker B. F. ii. 204. 

 Lichen parietinus Eng. Bot. t. 194. On trees and walls, abun- 

 dant. 



Thallus orbicular, bright yellow, the lobes marginal, radiating, ap- 

 pressed, rounded, crenateand crisped, granulated in the centre, beneath 

 paler and fibrillose. Shields deep-orange, concave, with an entire 

 border Used as a remedy for intermittent fevers, on account of its 

 bitterness. 



625 s s 



