PARMELIA.J PABMELIEI. 249 



shire ; Llaneltyd, near Dolgelly, Merionethshire ; Coe Coch, Snowdon, 

 Carnarvonshire; near Keudal, Westmoreland. Inverary and Appin, 

 Argyleshire ; Ben Lawers, Perthshire. Dunkerron, co. Kerry. 



18. P. Mougeotii Schjer. Enum. (1850) p. 46. Thallus small, 

 orbicular, oppressed and closely adnate, shining, greenish or greyish- 

 yellow, usually with yellowish-white tuberculose soredia ; beneath 

 rugose, brownish-black ; rhizinae 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-pulveruJent ; spores 

 0,008-10 mm. long, 0,005-6 mm. thick. Mudd, Man. p. 102; 

 Cromb. Lich. Brit. p. 34. Parmelia conspersa f. Mow/eotii Leight. 

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

 (et de.scr. pro parte). Brit. EA-S. : 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 plants sometimes become confluent. The thallus is frequently 

 greyish or dark in the eubcrustaceous centre, and the laciniae are occa- 

 sionally more discrete at the circumference. The apothecia, which art- 

 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,OOo-G mm. long, about 

 0,001 mm. thick. 



Hub. 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. M. : 

 Thetford Warren, Norfolk ; Withieland Penzance, Cornwall; Charmvood 

 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. 

 Curraghuiore, co. Waterford ; Dunkerron, co. Kerry ; Connemara, co. 

 Galway. 



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

 indeterminate, diffract; tbe lacinise very narrow, short, discrete, and 

 more or less scattered. Apothecia not seen. 



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

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

 sorediate, and is always sterile. 



Hob, On schist rocks in shady situations in subalpine tracts. Distr. 

 Local and scarce in the W. Highlands, Scotland. B. M. : Achosragan 

 Hill, Appin, Argyleshire. 



19. P. incurva Fr. Nov. Sched. Crit. (3826) p. 82. Thallus 

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

 greenish straw-coloured or ochroleueous, with somewhat large, 



