r.VRMELIA.] PAFMELIEI. 249 



shire; Llaneltyd, near Dol^'ell}', Merionetlishire ; Coe C'och, Snosvdon, 

 Carnarvonshire; near Kendal, Westmoreland. Inverary and Appin, 

 Argyleshire; ]5en Lawers, Perihshire. Dunkerron, co. Kerry. 



18. P. Mougeotii Sch.-er. Enum. (1850) p. 46.— Thallus small, 

 orbicular, aj)pres6ed and closely adnate, shining, greenish or greyish- 

 yellow, usually with yeUowish-white tuberculosa soredia ; beneath 

 rugose, brownish-black ; rhizina) not visible ; lacinise narrow, lineari- 

 multifid, slightly convex, sub-diffract in the centre, explanate at the 



apices, transversely rimose (K^yellowish, CaCl~). Apothecia 



minute, reddish-brown, the margin sulphureo-pulverulent ; spores 

 0,008-10 mm. long, 0,005-G mm. thick.— Mudd, Man. p. 102; 

 Cromb. Lich. Brit. p. 34. — Parmelia conspersa f. Moiujeotii Leight. 

 Lich. Fl. p. 136, ed. 3, p. 125. Lichen incurvus Eng. Bot. t. 1375 

 (et de.scr. pro parte). — Brit. Eas. : Leight. n. 143 ; Mudd, n. 74 ; 

 Cromb. n. 143 ; Larb. Lich. Herb. nos. 87, 251. 



Closely allied to P. conspersa, but distinguished by the frequent presence 

 of scattered soredia and by being much smaller in all its parts, though the 

 individual ])lants sometimes become confluent. The thallus is frequeutly 

 gi-eyish or dark in the suberustaceous centre, and the lacinise are occa- 

 sionally more discrete at the circumference. The apothecia, which are 

 rare in this country, as elsewhere, are few and scattered. The spermo- 

 gones, which are not frequent, are very minute, brownish-black, with 

 straight, short, subcylindrical spermatia, 0,00-5-6 mm. long, about 

 0,001 mm. thick. 



Hab. On rocks and boulders, chiefly granite and gneiss, in maritime 

 and upland districts. — Distr. Local and scarce in Great Britain and Ire- 

 land ; most frequent, perhaps, on the Grampians, Scotland. — B. 31. : 

 Thetford Warren, Noiiolk ; Wilhieland Penzance, Cornwall; Charuwood 

 Forest, Leicestershire ; near Barmouth and Capel Arthog, Merioneth- 

 shire ; Ingleby, Cleveland, Yorkshire ; Teesdale, Durham ; Near Kendal, 

 Westmoreland. New Galloway, Kirkcudbrightshire; Achosragan Hill, 

 Appin, Argyleshire ; Ben Lawers and Craig Tulloch, Perthshire ; Durris, 

 Kincardineshire ; Crathes, Aberdeenshire (.frt.) ; and Glen Dee, Braemar. 

 Curraghmore, co. Waterford ; Dunkerron, co. Kerry ; Counemara, co. 

 Galway. 



Form dispersa Cromb. Grevillea, xv. (1887) p. 75. — Thallus 

 indeterminate, diffract; the laciniae very narrow, short, discrete, and 

 more or less scattei ed. Apothecia not seen. 



This form no doubt is due to the normal evolution of the thallus being 

 arrested, so that it grows in an interrupted manner. It is but sparingly 

 sorediate, and is always sterile. 



Hah, On schist rocks in shady situations in subalpine tracts.— J)w<r. 

 Local and scarce in the W. Highlands, Scotland. — B, M. : Achosrag-an 

 HiU, Appin, Argyleshire. 



19. P. incnrva Fr. Nov. Sched. Crit. (1826) p. 82.— Thallus 

 orbicular or expanded, appressed, stellato-laciniosc, subopaque, 

 greenish straw-coloured or ochroleueous, with somewhat large, 



