122 LICHEXACEI. [STEREOCAULON-. 



aud subalpine tract?. Distr. General and common in all the mountainous 

 regions of Great Britain and Ireland, rare in the Channel Islands. 

 B. M. : La Moye, Island of Jersey. Near Mildenhall, Suffolk ; near 

 Buxton, Derbyshire ; Battersby Moor, Cleveland, Yorkshire ; Teesdale, 

 Durham ; Housesteads, Northumberland. Donne, near Stirling; Auchter- 

 house, Forfarshire ; Aberfeldy and Glen Fender, Perthshire ; Portlethen, 

 Kincardineshire ; Craig Guie, Braemar, Aberdeenshire. Mangerton, co. 

 Kerry. 



Form condyloideum Nyl. Lich. Scand. (1861) p. GO. Thallus 

 submoderate ; podetia rather longer, more or less branched, branches 

 shortly ramuloso-divided at the apices. Cromb. Lich. Brit. p.. 17 ; 

 Leight. Lich. Fl. p. 80, ed. 3, p. 72. Stereocaulon condyloideum 

 Ach. Meth. Suppl. (1803) p. 51 ; Sm. Eng. Fl. v. p. 237. 



This differs in being somewhat larger, with the podetia more frequently 

 and distinctly branched. The apothecia, which are usually aggregate and 

 terminal, are sometimes also infixed on the subtermiual branchlets. 



Hob. On turf-covered walls in upland districts. Distr. Local anil 

 scarce in N. England and among the Grampians, Scotland. B. 31.: 

 Housesteads, Northumberland. Ben Lawers and Glen Fender, Perth- 

 shire. 



9. S. pileatum Ach. Lich. Univ. (1810) p. 582; Fr. fil. Lich. 

 Scand. p. 51. Thallus small ; podetia very short, erect, slender, 

 simple or sometimes sparingly branched, the axis glabrous ; granules 

 squamulose or corallino-verrucaeform, usually conglomerate at the 

 base, scattered on the podetia, greyish. Apothecia terminal, pileato, 

 somewhat plane, at length slightly convex, brown or reddish-brown ; 

 spores 3-septate, fusiform, obtuse at either apex, 0,018-30 mm. 

 long, 0,0040-45 mm. thick. Cromb. Grevillea, xv. p. 15. Stereo- 

 caulon condensation var. cereolinum Cromb. Lich. Brit. p. 17 pro 

 parte ; Leight. Lich. Fl. p. 79, ed. 3, p. 72. Stereocaulon cereolinum 

 Sm. Eng. Fl. v. p. 233 pro parte : Mudd, Man. p. 67. Stereocaulon 

 cereolus Borr. Eng. Bot., Suppl. t. 2667 descr. pro parte. Brit. 

 Exs. : Larb. Lich. Hb. n. 6. 



From S. condensafAim, of which it has been regarded as a variety, this 

 is distinguished by the short and often nearly naked podetia, and by the 

 structure of the apothecia. It still more closely resembles Pilophorus 

 cereolus (Ach.), from which, however, it differs in the spores. The 

 podetia are closely affixed to the substratum, and are often in barren 

 plants sorediato-capitate at the apices. The cephalodia, which are 

 situated towards the base of the podetia, are verrucose, olive-brown or 

 dark-greyish, with the gonimia somewhat large or moderate, glomerulose. 

 In the British specimens the spermogones are sparingly present. 



Hab. On mountainous rocks in subalpine districts. Distr. Rare and 

 local in N. Wales, N. England, in S.W. Scotland, the W. Highlands, 

 and in N.W. Ireland. B. M. : Cader Idris and Dolgelly, Merioneth- 

 shire ; Teesdale, Durham ; Wastdale, Cumberland. New Gallowav, 

 Kirkcudbrightshire ; Ben Cruachan, Argyleshire ; Glen Ample and Glen 

 Lochay, Perthshire. Connemara, co. Galway. 



