120 LTCHENACET. [STEREOCAVI ON. 



apothecia are more scattered, usually larger and terminal. In this country 

 it is rarely and very sparingly fertile. 



Hob. On the ground and on boulders in subalpine districts. Distr. 

 Local and scarce among the Scottish Grampians and in W. Ireland. 

 B. M. : Ben Lawers and Ben Vrackie, Perthshire ; Morrone and Benna- 

 boord, Brae mar, Aberdeenshire. Kylemore and Connemara, co. Galway. 



7. S. denudatum Florke, Deutsch. Lich. Lief. iv. (1819) p. 13. 

 Thallus somewhat small or moderate ; podetia nearly erect, slender, 

 smoolh, loosely aggregate, somewhat simple or branched above, 

 attenuate at the apices, the axis naked ; podctial granules subpel- 

 tate, at first subrounded, then applanate and depressed in the 

 middle, whitish or greyish-white, darker in the centre, the margin 

 usually cronulate, white. Apothecia small, lateral, plane or some- 

 what convex, brownish ; spores elongato-fusiform, 3- (rarely 5-) 7- 

 septate, 0,026-46 mm. long. 0,003-4 mm. thick. Mudd, Man. 

 p. 66; Cromb. Lich. Brit. p. 17 ; Leight. Lich. Fl. p. 79, ed. 3, 

 p. 71. Coralloides crispum et botryforme alpinum Dill. Muse. 114, 

 t. 17. f. 33. Lichenoides non tubiilosum, cinereum ramosum totum 

 crustaceinn Dill, in Hay, Syn. ed. 3, 66. 11. S. pasclialis pro parte 

 of some authors. Brit. Exs. : Larb. Lich. Hb. n. 244. 



Easily distinguished from other British species by the subpeltate gra- 

 nules Avith whitish margin, and by their paucity or absence towards the 

 apices of the podetia. The cephalodia are olive-brown., somewhat shining, 

 glomerulose or verrucose, with the gonimia sordid glaucous-green. In 

 this country the apothecia are rare, nor are the spermogones very fre- 

 quent, the spermatia being 0,008-9 mm. long, 0,00o mm. thick. On the 

 podetia are commonly seen the pulvinuli of Sirosiphon saxiuola Naeg. 



Hub. On rocks and boulders from upland to alpine situations. Distr. 

 General and frequent in the more mountainous districts of Great Britain 

 and Ireland : very abundant among the Grampians in Braemar. B. M. : 

 Cawsand Beacon and Sharpitor Rock, Dartmoor, Devonshire ; Plynlim- 

 mon, Cardiganshire ; Cader Idris, Merionethshire ; Snowdon, Carnarvon- 

 shire ; Island of Anglesea ; Mynydd-y-Myffe, Shropshire ; Teesdale, 

 Durham; Stavely Head, Westmoreland ; Ennerdale, Cumberland. Ben 

 Lawers and Rannoch Moor, Perthshire ; Sidlaw Hills and Clova, Forfar- 

 shire ; Glen Candlic, Cairn Drochit and Ben-naboord, Braemar, Ben 

 Nevis, Inverness-shire ; Island of Skye ; Applecross, Ross-shire ; Lairg, 

 Sutherlandshire. Killarney, co. Kerry ; Kylemore, Connemara, co. Gal- 

 way. 



Form 1. validum Laur. in Fr. Lich. Eur. (1831) p. 205. Thallus 

 larger, caespitose ; podetia thicker, divided towards the base into 

 elongate branches ; granules aggregate and sometimes discoid. 



This is larger, with more robust and caespitose podetia, and crowded 

 and often somewhat large granules. It occurs only sterile. 



Hab. On schistose rocks in alpine situations. Distr. Very local and 

 scarce, among the S. Grampians. B. M. : Ben Lawers, Perthshire. 



Form 2. capitatum Flot. in Koerb. Syst, (1856) p. 13. Podetia 

 sorediate and somewhat turgid at the apices. Apothecia arising 

 from the soredia. 



