lecidea] lecideace^ 59 



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

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

 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. Fl. ed. 3, p. 179 (1879). 

 Exsicc. Cromb. n. 64. 



Externally this species has a general resemblance to L. auriculata 

 var. diducens, 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 Gowar, 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 4- 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. scotina, 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 

 Tulloch, 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. 



Exsicc. J^arb. Lich. Hb. n. 338. 



Allied to the preceding, but readily distinguished by the aggregate 

 thallus, which is often overrun by a sterile Sirosiphon. The sper- 



