242 LICHENACEI. [PARMELIA. 



General and common in the mountainous tracts of Great Britain, espe- 

 cially in the Scottish Highlands ; apparently rare in S. and W. Ireland 

 and in the Channel Islands. B. M.: Island of Alderney. Eridge Rocks 

 and Ardinffley, Sussex; New Forest, Hampshire; near South Brent, 

 Devon; near* Penza nee and Helminton, Cornwall; Savernake Forest, 

 Wiltshire ; Charnwood Forest, Leicestershire ; Malvern. Worcestershire ; 

 Black Edge, Buxton, Derbyshire ; Wrekin Hill, Shropshire ; Lambeth, 

 S. Wales ; Barmouth and near Dolgelly, Merionethshire ; Cleveland, 

 Yorkshire ; Kentmere, Westmoreland ; Keswick, Cumberland. Dal- 

 mahoy Crags, near Edinburgh ; near Helensburgh, Dumbartonshire ; 

 Appin, Argyleshire; Ben Lawers and near Dunkeld, Perthshire; Clova 

 and Cortachy, Forfarshire ; Crathes, Aberdeenshire ; Glen Callater, Mor- 

 roue, and Ben Avon, Braemar, Abjrdeenshire ; Glen Nevis, Inverness- 

 shire. Lambay Island, near Dublin ; near Cork ; Dunkerron, co. Kerry ; 

 Kyleraore, co. Galway. 



11. P. sulcata Tayl. in Mack. Fl. Hib. ii. (1836) p. 145. 

 Thallus orbiculari-expanded, membranaceous, smoothish, not isidii- 

 ferous, irregularly imbricate, reticulato-sorediate, greyish or glau- 

 cous-white, tbe soredia sulciform, rotundato-oblong or linear, mar- 



gined, Whitish (K+^thenblood-red,^ 01 !)' A P thecia and 

 spores as in the preceding species. Cromb. Grevillea, xv. p. 75. 

 ParmeUa saxatilis var. sulcata Cromb. Lich. Brit. p. 34 ; Leight. 

 Lich. Fl. p. 138, ed. 3, p. 126. ParmeUa saxatilis ft. leucocliroa 

 (Wallr.) Mudd, Man. p. 94. Lichenoides vulgatissimum cinereo- 

 ylaucum, lacunosum et cirrhosum Dill. Muse. 188, t. 24. f. 83 B. 

 Brit. Exs. : Leight. n. 203 ; Mudd, n. 66 ; Cromb. n. 28. 



Distinguished from P. saxatilis by the soredia and the absence of isidia. 

 The thallus often spreads extensively and varies in the breadth of the 

 lacinias ; short and broad states are form rosceformis Ach. (Lich. Univ. 

 p. 470). The apothecia are moderate, and sometimes have rather smaller 

 spores than in the preceding species. They are comparatively rare in 

 Britain as elsewhere, nor are the spermogones frequent in our specimens. 



Hob. On trees and old walls, chiefly in maritime and upland districts. 

 Distr. General and usually plentiful in Great Britain and Ireland ; rare 

 in the Channel Islands ; fertile chiefly in the Highlands of Scotland. 

 B. M. : Island of Guernsey. Epping and Hainault Forests, Essex ; New 

 Forest, Hants ; Penzance and Witbiel, Cornwall ; near Cirencester and 

 Sapperton, Gloucestershire ; Darley, Derbyshire ; Grimsbury Green, 

 Northamptonshire ; Ludlow, Shropshire ; Harboro' Magna, Warwick- 

 shire ; near Hopton, Cheshire ; Cleveland, Yorkshire ; Kendal, West- 

 moreland ; near Hexham, Northumberland. Dairy, Kirkcudbrightshire ; 

 Dreghorn and Craig Lochart, near Edinburgh; Barcaldine, Argyleshire; 

 Loch Katrine and Killin, Perthshire ; Den of Murtle, near Aberdeen ; 

 S. of Fort William, Inverness-shire ; Applecross, Koss-shire. Rostellan, 

 co. Cork ; Dunkerrcn, co. Kerry. 



Var. ft. laevis Nyl. Syn. i. (1860) p. 389. Thallus smooth, eso- 

 rediate, glaucous- or greyish-white ; beneath black, densely rhizineo- 

 fibrillose ; laciniae narrow, more divided and discrete, greyish or 

 brownish at the apices. Apothecia not seen. Cromb Journ Eot 

 1875, p. 140. 



