54 ACOTYLEDONS. LICHENS. Parmclia. 



multifid divergent plane or slightly grooved their margins 

 elevated lacerated, apothecia durk brown the margin granu- 

 lated. Ack. Syn. Lick. p. 204. Lie/ten fahlunensis, Lightf. 

 p. 819. E. B. *. 653. 

 HAB. Rocks on the more elevated Highland mountains, not uncommon. 



13. P. stygia, thallus stellated shining pitchy black, beneath black 

 and almost naked, the segments nearly linear multifid and 

 somewhat palmate convex, the margins and extremity recurved, 

 apothecia of the same colour at length black with the margin 

 crenated. Ach. Syn. Lich. p. 205. Lichen stygius, E. B. 

 t. 2048. 



HAB. Summits of the Highland mountains, plentiful, as upon Ben 

 Nevis, growing on the rocks. 



14. P. aqtiila, thallus orbicular tawny brown paler beneath with 

 blackish fibres, the segments multipartite nearly linear convex 

 those of the circumference dilated nearly plane and crenate, 

 apothecia dark brown their margin crenated. Ack. Syn. Lich. 

 p. 205. Lichen pullus, LightJ'. p. 825 (according to Smith). 

 Lichen aquilus, E.B.t. 982. 



HAB. Rocks, hot unfrequent, as in the King's Park, Edinburgh, &c. 

 Lightf. Hermitage and Pentland Hills, Maugh. 



15. P. e?icausta, thallus stellated pale grey, beneath black unequal 

 naked, the segments often uniting convex and almost rounded 

 linear multifid roughish dotted with black, apothecia reddish 

 brown their margin somewhat crenulated. Ach. Syn. Lich. 

 p. 206. Lichen encauslus, E. B. t. 2049. 



HAB. Plentiful on rocks on the summit of Ben Nevis, where it was 

 first discovered by Dr. Stuart. 



16. P. recurva, thallus stellated pale greenish bearing powdery 

 warts, beneath black with spongy fibres, the segments of the 

 circumference multifid very narrow convex and almost rounded, 

 apothecia reddish brown their margin nearly entire. Ach. Syn. 

 Lich. p. 206. Lichen incurvus, E. B. t. 1375. 



HAB. Rocks, Dickson and G. Don. On Ben Lomond, rare, Mr. 

 Turner and Hook. 



\1 . P. sinuosa, thallus stellated pale yellowish grey smooth, black 

 and fibrous beneath, the segments broadly linear sinuato-pin- 

 riatifid their sinuses broad and circular ^ apothecia nearly plane 

 dark brown, their margin thin entire. Ach. Syn. Lich. p. 207. 

 Lichen sinuosus, E. B. t. 2050. 



HAB. First discovered by Mr. James Burgess Mac-Garroch on moor- 

 stones in Dumfries -shire. Old walls at Ballacheulish, Mr. Turner 

 and Hook. Stones on Cathkin Hills, not unfrequent, Hoplc. 



This has never, I believe, been found with shields in Britain ; nor, 

 indeed, has it been met with out of Scotland. 



18. P.aleurites, thallus orbicular continuous rugose pale grey pul- 

 verulent, beneath of the same colour with blackish fibres, seg- 



