60 LECANO-LECIDEKI [lECIDEA 



mogones have the spermatia arcuate, 0,014-18 mm. long, 0,005 mm. 

 thick. 



Hah. On boulders in an upland situation. — B. M. Charnwood 

 Forest, Leicestershire (the only locality). 



97. L. vitellinaria Nyl. in Bot. Not. 1852, p. 177.— Thallus 

 absent. Apothecia sessile, minute, concave, at length plane, 

 margined, black, the margin slightly prominent, shining, within 

 greyish-black ; paraphyses concrete, greenish-black at the apices ; 

 hypothecium thin, brownish ; spores elliptical or oblong, 1 or 2- 

 guttalate, 0,010-12 mm. long, 0,006 mm. thick ; hy menial gelatine 

 bluish then violet with iodine. — Mudd Man. p. 212, t. 3, f. 77 ; 

 Cromb. Lich. Brit. p. 78 ; Leight. Lich. Fl. p. 355 ; ed. 3, p. 384. 



Exsicc. Leight. n. 182. 



A singular species, easily recognized by the contrast of colour 

 between the fructification and the host. The apothecia in structure, 

 as observed by Nylander (Lich. Scand. p. 218), are almost those of 

 L. parasema or some of its varieties. 



Hob. Parasitic on the thallus of Lecanora vitellina upon rocks 

 and walls in upland situations. — Distr. Only a few localities in 

 W. and N. England and the S. and Central Grampians, Scotland. — 

 B. M. Lyth Hill and Haughmond Hill, Shropshire ; Malvern, Wor- 

 cestershire ; near Newton and Battersby, Cleveland, Yorkshire ; near 

 Lawers Inn and at Blair Athole, Perthshire. 



98. L. fuliginosa Tayl. in Mackay Fl. Hib. ii. p. 131 (1836). 

 — Thallus dark-brown or reddish, granular-squamulose, con- 

 glomerate (K — , CaCl — ), hypothallus blackish-brown, byssoid. 

 Apothecia black, small, solitary or aggregate, somewhat convex, 

 with a thin margin which is soon obliterated ; hypothecium 

 thick, brownish- black ; paraphyses coherent, pale-yellowish-brown, 

 brownish- or bluish-black at the apices ; spores ellipsoid, small, 

 0,008-10 mm. long, 0,004-6 mm. thick ; hymenial gelatine, 

 especially the asci, bluish with iodine. — Mudd Man. p. 208 ; 

 Cromb. Lich. Brit. p. 77 ; Leight. Lich. Fl. p. 255 ; ed. 3, p. 47. 

 L. covfusa Nyl. Lich. Scand. p. 216 (1861). 



Exsicc. Leight. n. 305. 



At once distinguished by its scattered and friable squamulose thallus, 

 and brownish-black somewhat byssoid hypothallus. According to Th. 

 Fries (Lich. Scand. p. 421) the hypothallus is a species of Sirosiphon, 

 which grows intermixed with this lichen. 



Hah. On siliceous rocks. — Distr. In mountainous districts through- 

 out the British Islands. — B. M. Barmouth, Merioneth ; Llanbedrog 

 and Llyn Geirionydd, Carnarvon : Glen Fender, Blair Athole, Perth- 

 shire ; Dunman way, Cork ; Glengaaft, Carig Mt., Kerry; Doughruagh 

 Mt., Connemara, Galway. 



Yar. subconrusa A. L. Sm. — Differs from the type in the 

 somewhat darker more finely granular thallus, in the small innate 

 apothecia, and the rather smaller spores, 0,007-8 mm. long, and 



