lecidea] lecidbace* 59 



smooth and shining, crenulate, glaucous-white, very small, and 

 crowded round the groups of apothecia (K + yellow, OaCl + 

 yellow), hypothallus black, little visible. Apothecia black, large, 

 crowded and deformed, shining, plane or convex, with a thickish 

 slightly paler margin ; hypothecium colourless, lateral walls thin, 

 dusky-blackish, often continuous under the hypothecium as a 

 thin dusky line; paraphyses coherent, greenish-black at the 

 apices; spores ellipsoid, 0,011-15 mm. long, 0,006-8 mm. thick ; 

 hymenial gelatine bluish then sordid-yellow with iodine.— 

 Cromb. in Journ. Bot. ix. p. 179 (1871). Lecanora nigro- 

 glomerata Leight. Lich. PI. ed. 3, p. 179 (1879). 

 ExsicG. Cromb. n. 64. 



Externally this species has a general resemblance to L. mi/riculata 

 var. d/iducens, but is sufficiently distinguished by the squamulose 

 dispersed thallus, the colourless hypothecium, and the apothecia 

 internally colourless. 



Hab. On quartzose stones in bare alpine places. — B. M. Summit 

 of Cairn Growar, Ben-y-gloe, Blair Athole, Perthshire (the only 

 locality). 



95. L. scotinodes Nyl. in Flora Ivi. p. 295 (1873).— Thallus 

 subdeterminate, thinnish, unequal, areolate-rimose, dark-greyish. 

 Apothecia small, convex, immarginate, black, hypothecium 

 colourless ; paraphyses moderate, dark-blue at the incrassate 

 apices ; epithecium K + pale- violet ; spores oblong, simple or 

 occasionally 1-septate, 0,014-18 mm. long, 0,005-6 mm. thick ; 

 hymenial gelatine bluish then tawny-wine-coloured or reddish 

 with iodine. — Cromb. in Grevillea ii. p. 90; Leight. Lich. Fl. 

 ed. 3, p. 332. 



Allied to L. scoUna, a plant of Bavaria, but differs in the esqua- 

 mulose thallus, the convex apothecia, the larger spores and other 

 characters given. The numerous apothecia are occasionally some- 

 what crowded. 



Hab. On schistose rocks in subalpine tracts. — B. M. Craig 

 TuUoch, Blair Athole, Perthshire (the only locality). 



96. L. aggregatula Nyl. in Flora Ixvi. p. 101 (1883).— Thallus 

 thickish, indeterminate, minutely granulate, the granules aggre- 

 gate, grouped in areolae, whitish or greyish-white (K — , 

 CaCl — ). Apothecia small, adnate, plane, subrugulose and at 

 times more or less congregate, opaque, blackish or brownish- 

 black, immarginate or subimmarginate, pale within ; epithecium 

 brown ; paraphyses slender, somewhat clavate and brown at the 

 apices; hypothecium colourless; spores oblong. 0,011-15 mm. 

 long, 0,005-6 mm. thick ; hymenial gelatine bluish then tawny- 

 wine-coloured with iodine. — Cromb. in Grevillea xii. p. 90. 



Exsiee. Larb. Lich. Hb. n. 338. 



Allied to the preceding, but readily distinguished by the aggregate 

 thallus, which is often overrun by a sterile Si/rosvphon. The sper- 



