52 ACOTYLEDONS. — LICHENS. ParmelKt. 



17. PARMELIA. 



Universal receptacle fdl'uu.-eor.s, between coriaceous and membr;i- 

 naceous. spreading-, ;ij)pressed, orbicular, lobed and stellated or 

 mnltifid and laciniated, fibrous beneatb. Partial recept. 

 scuteliiform, fubineinbranaceous, lieneatb formed of the thallus, 

 free, and attached to it by a central point. Di.'ik concave, 

 coloured, its margin formed by the inilexed crust. 



* Thallns with its sc;piicnls not mflated at the. extrenntij (Circinarla). 



1. P. glomulifera, thallus cartilaginous rigid orbicular livid and 

 glaucous smooth bearing dark green scattered tufted excres- 

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

 niated angular, apoth.ccia reddish brown rugose at the margin. 

 Ach.Sijn.lAck.p.M)^. Lichen glomuiiferns, E.£. t.293. 

 Light/, p. 853. 



Ha3. Trunks and roots of trees in shady woods, but not common, 

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

 apothecia, Mr. Turner and Hook. Pcntland hills, Maugh. 



2. P. caperata, thallns 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, j'ich. Syn. 

 Lich. p. lOQ. Lichen caperatns, Light/', p. 1^37 . E. B. 

 t.654. 



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



3. P. perlnta, thallus orbicular greyish white smooth, blackish 

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

 gin vvaved entire, apothecia brown their margin thin entire. 

 Ach. Syn. Lich. p. 197. Lichen perlatus. Light/, p. S39. 

 E.B.t.34l. 



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



4. P. herhacea, thallus orbicular membranaceous bright green 

 above, beneath pale brown almost while and downy, lobes 

 waved and cut the segments rounded subcrenate, apothecia 

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

 p. 199. Lichen Icete-virens, Light/, 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 roimded and crenate, apothecia dark brown the mar- 

 gin crenulated. ykh. Syn. Lich. p. 200. Lichen oUvacens, 

 Light/, p. S\8. E.B.t.2lS0. 



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 



