liECIDEA] LECIDEACE^ 45 



G2. L. Henrica Larb. ex Nyl. in Flora Ix. p. 563 (1877).— 

 Thallus white, tartareous, thickish, continuous, smooth, slightly 

 rimulose (K-f- yellow, CaCl + yc^How). Apothecia pale yellow- 

 flesh-coloured, scattered, sessile plane or convex, with an obtuse 

 margin or subimmarginate ; hypothecium colourless ; paraphyses 

 distinct, thick, colourless at the apices ; spores 4, 6 or 8 in the 

 ascus, ellipsoid or fusiform-ellipsoid, 0,015-20 mm. long, 0,006- 

 7 mm. thick ; hymenial gelatine blue then yellow, the asci 

 violet-yellow, with iodine. — Cromb. in Grevillea vi. p. Ill ; 

 Leight. Lich. Fl. ed. 3, p. 298. 



ExsicG. Larb. Lich. Hb. n. 171. 



Hab. On rocks in shady localities. — B. M. Ravine near Kylemore, 

 'Gal way (the only locality). 



63. L. rusticula Nyl. in Flora xlix. p. 371 (1866).— Thallus 

 •effuse, granulate, the granules depressed-convex, subcrenate, 

 smooth, glaucous- white (K -f yellowish, K (CaCl) -f yellow). 

 Apothecia minute, somewhat plane, margined, black, the margin 

 'entire at length obliterated ; paraphyses concrete ; epithecium 

 vaguely brownish ; hypothecium brown; spores ellipsoid, 0,0 10- 

 15 mm. long, 0,005-8 mm. thick ; hymenial gelatine deep-blue 

 then sordid-yellowish with iodine. — Leight. in Ann. Mag. Nat. 

 Hist. XX. p. 407 (1867) ; Cromb. Lich. Brit. p. 84 ; Leight. Lich. 

 Fl. p. 271 ; ed. 3, p. 272. 



Related to L. expansa, but, among other differences, separated by 

 ■the character of the thallus and the larger spores. The apothecia, at 

 first concave with the margin obtuse, are but few and scattered in the 

 small specimen seen. The spermogones have not been detected. 



Hah. On quartzose rocks in mountainous districts. — Distr. Found 

 only very sparingly in N. Wales and N.W. Ireland (Salrock Road, 

 'Connemara, Galway fide Leight. Lich. Fl. ed. 3 I. c). — B. M. Giant's 

 Pebbles, Cader Idris, Merioneth. 



64. L. rusticella Nyl. in Flora Ixi. p. 245 (1878).— Thallus 

 effuse, thin, subleprose, whitish-ochraceous (K-f reddish, CaCl — ). 

 Apothecia minute, convex, immarginate, black, opaque, dark 

 within ; paraphyses concrete ; epithecium and hypothecium brown 

 or brownish; spores suboblong, 0,006-9 mm. long, 0,0025-35 mm. 

 thick ; hymenial gelatine bluish then tawny -wine-red with iodine. 

 — Cromb. in Grevillea vii. p. 97 ; Leight. Lich. Fl. ed. 3, p. 252. 



Comparable with L. rusticula, but distinct in the character of the 

 thallus and in the smaller spores. The colour of the thallus, which 

 Nylander, I. c, says may be normally greyish, is evidently due to 

 suffusion by peroxide of iron. The apothecia are rather scattered. 



Hah. On schistose stones of a wall in an upland situation. — B. M. 

 Tullywhee Bridge, Connemara, Galway (the only locality). 



65. L. livescens Leight. in Grevillea iv. p. 78 (1875). 



Thallus white, granulose or granulate-verrucose (K — , CaCl-f 

 pale-reddish), the granules scattered and dispersed on a black 



