Parmeha.] L1CHENES. 109 



Trunks of trees, rocks and old pales, frequent in mountainous coun- 

 tries. — This and the preceding are among the largest and handsomest 

 of the British Lichens. 



3. P. conspersa, Ach. (greenish Chest nut- shielded Parmelia); 

 thallus orbicular membranous lobed and sinuated pale greenish- 

 yellow with scattered dark points granulated in the centre, 

 beneath brown with black fibres, apothecia near the centre dark 

 chestnut-brown with an inflexed border. — Ach. Syn. p. 209. — 

 Lichen consj>ersus, Ach. 



On rocks and stones in mountainous countries. 



4. P. scortea, Ach. (leathery granular Parmelia); thallus or- 

 bicular submembranaceous lobed and sinuated greyish-white 

 with innumerable dark granulations black and rough beneath, 

 apothecia bright chestnut with an inflexed crenated border. — 

 Ach. Syn. p. 197. — Lichen scorteits, Ach. Prodr. — E. Bot. 

 t. 2065. 



On trees and pales, in Surrey and Sussex, Mr. Barren and in other 

 places ; but always barren. 



5. P. Borreri, Turn. (Borrerian Parmelia); thallus orbicu- 

 lar submembranaceous broadly lobed and sinuated tawny-grey 

 sprinkled with white powdery warts brown and somewhat 

 fibrous beneath, apothecia bright chestnut with an elevated 

 inflexed border. — Turn, in Linn. Trans, v. 9. p. 148. t. 13./. 2. 

 Ach. Syn. p. 197.— Lichen Tumeri, E. Bot. t. 1780. 



Trunks of trees, especially fruit-trees, and on stones in Sussex. Norfolk. 

 On a wall at Luss, Scotland ; and elsewhere. — Distinguished from the 

 following more abundant species, by its less deeply divided and broader 

 lobed thallus, of a yellower green colour, in the absence of elevated re- 

 ticulated powdery veins and pits, in the presence of white powderj 

 warts and in the paler and less fibrous underside. Its fructification is 

 very rare. 



(i. I*. saxdiiHs, Ach. (grey Stone Parmelia); thallus orbicular 

 grey deeply lobed and sinuated imbricated with retuse -em- 

 inent-, the upper side rough with pits and raised reticulated 

 powdery lines, black and shaggy beneath, apothecia dark-brown 

 with an inhVxed crenated border. — Ach. Syn. j>. 203 — Lichen 

 taxatOU, Linn.—i:. Bot. t. 603 Dill. Muse. /. 24. /: 88. 



Very frequent upon trees, rocka and Btones, especially in mountain' 

 on-, countries. — In Scotland it i> collected abundantly by the peasantrj 



and used, with the follow U . to dye woollen stuffs of 8 dirty pur- 



ple. 



7. P, omphalddes, Ach. (purple Rock Parmelia); thallus orbi- 

 cular dark purplish-brown shining with pale sigxag cracks much 

 (obed and multifid imbricated the segments truncated black and 

 shaggy beneath, apothecia dark-brown with an inflexed crenated 

 border. — Ach. Syn. p. 208, Lichen ompkalodet I I ' 



t. 604. — Dill. Mute. t. 24. /. 80. 



<)n locks and stones; most abundant on exposed moors.— I 



