Parmdia.] LICHENES. 201 



lar olive-brown rugged in the centre and often granulated the 

 margin lobed and crenated appressed brownish and fibrous be- 

 neath, apothecia brown concave with an inflexed crenated bor- 

 der.—^. Syn. p. 200. — Lichen olivaceus, Linn — E. Bot. 



t. 2180 Dill. Muse. t. 24./. 77, 78. 



On the bark of trees, park-pales, &c. frequent. 



14. P. corrugdta, Ach. (wrinkle-shielded Parmelia); thallus 

 orbicular membranaceous somewhat rugged of a dark glaucous- 

 green lobed cut and rounded Rubricated waved blackish and 

 fibrous beneath, apothecia large concave red-brown externally 

 wrinkled with a crenate inflexed border.— Ach. Syn. p. 199. 

 —Lichen corrugatus, Sm. in Linn. Trans, v. I. p. 83. h. Bot. 

 t. 1652.— Dill. Muse. t. 24./. 79. 



Saham wood, Norfolk, Sir J. E. Smith. Trunks of old Thorns, Ick- 

 worth Park, near Bury, Suffolk; Rev. G. R. Leathes.-Thetege, rug- 

 ged, concave apothecia and larger wavy thallus distinguish this species 

 from P. olivacea, with which it has sometimes, but most incorrectly, been 

 confounded. 



15. P. pulveruUnta, Ach. (green powder// Parmelia); thallus 

 orbicular stellated deep glaucous-green hoary ash-coloured .when 

 dry cut into numerous oblong multifid flat and obtuse wrinkled 

 segments black and downy beneath, apothecia glaucous-black 

 with a thick inflexed at length leafy border.— Ash. Syn.p.2\4. 

 —Lichen pulveruUmtus, Sehnb.—E. Bot. t. 2063.— Dill. Muse 



/. 24./. 71. 



Very common on the trunks of trees. 



16. P. pittfrea, Ach. (scurfy imbricated Parmelia); thallus 

 orbicular imbricated glaucous-green hoary ash-coloured when 

 dry its segments dilated concave rounded crenate very powdery 

 at "their lateral margins pale and hl.mus beneath, apothecia 

 glaucous-black with a broad inflexed very powdery border. 

 Sm.— Ach. Syn. p. 201.— Lichen pit gnus. Ach. Prmlr.—L. Bot. 

 ,. 2064.— L. pulverulentus, Ehrh.— L. kmuginomts, Boffin. 

 Enum. , ,,. 



Trees and walls, in Norfolk and Suffolk, common About Glasgow, 

 Dr. Scouier. 



17 |» s!, linns. Ach. ( hlurh-shifhlrd stillatcd Panmlia); thal- 

 us orbicular stellated pale unchangeable grey the segments 

 linear rather convex multifid beneath whitish with dark fibres, 

 apothecia greyish-black with an entire elevated at length indexed 

 border.—- Ach. Syn. p. 216.— Lichen stettaris, l.nm.— l.. Bot 

 t. 1697. -/>///. Muse. t. 24./ 70. 

 I'm quent on the bark of ti 



Is. i } . '. Ach. (elegant garland Parmelia); thaJlui Bt< U 



laled imbricated somewhat cartilaginous greenish-white col into 

 numerous linear multifid segments powderj si the extremities 

 and obtuse beneath snow-white with grej fibres, spotnecia 



