244 LICHENACEI. [PARMELIA. 



Coinnoch, Morrone, Glen Dee, Braemar ; near Aviemore, and Ben Nevis, 

 Inverness-shire ; Applecross, Ross-shire. Dunkerron and Caher, co. 

 Kerry. 



Form caBsio-pruinosa Kyi. ex Stiz. St. Gall. ]S T at. Ges. (1876) 

 p. 206. Thallus and the thalline margin of the apothecia cacsio- 

 pruinose. Cromb. Jourc. Bot. 1882, p. 272. subsp. Parmelia 

 omplialodes f. ccesiopruinosa Nyl. ex Norrl. Not. Sallsk. pro F. et 

 Fl. Fenn. Forh. xiii. (1873) p. 324. 



This differs merely in the presence of the csesions pmina, which, 

 however, at length becomes more or less obsolete, and the thallus is 

 sometimes of a bluish tint. The few British specimens yet seen are 

 sterile. 



Hab. On rocks in alpine situations. Distr. Found only on two of the 

 S. Grampians, Scotland. B. M. : Summits of Craig Calliach and Ben 

 Lawers, Perthshire. 



Yar. /3. panniformis Ach. Meth. (1803) p. 204 pro parte. Thallus 

 more or less effuse, the laciniae much narrower, shortly dissected 

 and imbricate. Apothecia small or submoderate. Kyi. ex Stiz. St. 

 Gall. Nat. Ges. (1876) p. 206 ; Cromb. Grevillea, xv. p. 73. Par- 

 melia saxatilis var. panniformis Cromb. Lich. Brit. p. 34 ; Leight. 

 Lich. Fl. p. 139, ed. 3, p. 128. 



Forms a densely imbricate and congested crust which is somewhat 

 effuse. It is usually less shining than the type. The apothecia are 

 occasionally present, but are not numerous. 



Hab. On rocks and boulders in upland and subalpine regions. Distr. 

 Not general, though plentiful in S.W. and W. England, N. Wales, S. 

 Scotland, and on the Grampians. B. M. : Hay Tor, Dartmoor, and Did- 

 worthy, Devonshire ; near Penzance and Helminton, Cornwall ; Llyn 

 Gwrionydd, Merionethshire. Stiperstones Hill, Shropshire. New Gal- 

 loway, Kirkcudbrightshire ; Ben Cruachan, Argyleshire ; Ben More, Ben 

 Lawers, and Rannoch, Perthshire ; Canlochan, Forfarshire ; Morrone and 

 Ben-naboord, Braemar, Aberdeenshire ; Ben Nevis, Inverness-shire. 



Form 1. glomulifera Cromb. Journ. Bot. 1872, p. 307. Thal- 

 lus with scattered, isidioid, nodulose, dark-brown or blackish 

 glomeruli. Leigbt. Lich. Fl. ed. 3, p. 126. 



Only var. panniformis with a few glomeruli, subsimilar in appearance, 

 though differing in structure, to those of Ricasolia amplissima. These 

 abnormal growths are probably peculiar to sterile states of the plant. 



Hab. On boulders in subalpine tracts. Distr. Rare and local on the 

 mts. of N. Wales and the Scottish Grampians. B. M. : Cym Idwal, 

 Carnarvon. Morrone, Braemar, Aberdeenshire. 



Form 2. subconcentrica Cromb. Journ. Bot. 1872, p. 306. 

 Thallus panniform, snbspherical, growing involved in concentric 

 layers. Leight. Lich. Fl. ed. p. 128. 



A peculiar state analogous to P. reroluta var. concent rica, though the 

 few specimens gathered were not so globular. As observed in Journ. 



