52 ACOTYLEDONS. LICHENS. Parmelia. 



17. PARMELIA. 



Universal receptacle foliaceous, between coriaceous and membra- 

 naceoiis. spreading, oppressed, orbicular, lobed and stellated or 

 multifid and laciniated, fibrous beneath. Partial recept. 

 scntelliform, submembranaceous, beneath formed of the thallus, 

 free, and attached to it by a central point. Disk concave, 

 coloured, its margin formed by the inflexed crust. 



* Thallus with its segments not inflated at the extremity (Circinaria). 



1. P. gloimili/'era, thallus cartilaginous rigid orbicular livid and 

 glaucous smooth bearing dark green scattered tufted excres- 

 cences, tawny beneath and downy, the lobes waved and laci- 

 niated angular, apothecia reddish brown rugose at the margin. 

 Ach. Syn. Lich. p. 195. Lichen glomnliferus, E. B. t. 293. 

 Lightf. p.853. 



HAB. Trunks and roots of trees in shady woods, but not common, 

 Light/. Duke of Argyle's grounds, near Inverary, but without 

 apothepia, Mr. Turner and Hook. Pentland hills, Maugli. 



2. P. caperala, thallus orbicular pale yellowish green rugose at 

 length granulated black and hispid beneath, the lobes waved 

 laciniated rounded nearly entire, apothecia scattered brown 

 their margin incurved entire at length pulverulent. Ach. Si/??.. 

 Lick. p. J96. Lichen caper atus, Lightf. p. 837. '.E.'l3. 

 t.654. 



HAB. Trunks of trees, rocks, and pales, frequent. 



3. P. per la t a, thallus orbicular greyish white smooth, blackish 

 brown and hairy beneath, lobes rounded cut plane, their mar- 

 gin waved entire, apothecia brown their margin thin entire, 

 Ach. Syn. Lich. p. 197. Lichen perlatus, Lightf. p. 839. 

 E.B.t.34\. 



HAB. Trunks of oaks and other trees, very common, Lightf. 



4. P. herbacea, thallus orbicular membranaceous bright green 

 above, beneath pale brown almost white and downy, lobes 

 waved and cut the segments rounded subcrenate, apothecia 

 red, the margin inflexed rugose and crenate. Ach. Syn. Lich. 

 p. 199. Lichen Icele-virens, Lightf. p. 852. E. B. t. 294. 



HAB. Trunks and roots of trees, sometimes on rocks in moist shady 

 places, not uncommon. 



5. P. olivacea, thallus orbicular olive brown rugged with elevated 

 points paler beneath and fibrous, lobes radiating appressed plane 

 dilated rounded and crenate, apothecia dark brown the mar- 

 gin crenulated. Ach. Syn. Lich. p. 200. Lichen olivaceus, 

 Lightf. p. SIS. E. B. t. 2180. 



HAB. On trees and rocks, common. 



6. P. parietina, thallus orbicular bright yellow, beneath paler 

 and fibrillose, the lobes radiating appressed plane dilated 

 rounded crenate and crisped at the extremity, apothecia of 



