96 LECANO-LECIDEEI [lECIDEA 



apices, and tlici'e usually separate ; spores ellipsoid, 0,008-11 inm> 

 long, 0,006-7 mm. thick ; hymenial gelatine pale-bluish with 

 iodine. — Cromb. Lich. Brit. p. 85; Leight. Lich. Fl. p. 291 ; ed^ 

 3, p. 297. 



The thallus is sometimes mncose-gelatinous, resulting probably 

 from the habitat. In our specimens the apothecia are somewhat 

 scattered. The spermogones are frequent, with sin)ple, short sterig- 

 mata and ellipsoid, oblong spermatia, about 0,004 nmi. long, 

 0,0015 mm. thick. 



Hah. On shady rocks in mountainous districts. — Distr. Local and 

 scarce in N. Wales and S.W. Ireland. — B. M. Trefriw Falls, Denbigh- 

 shire ; Croghan, Killarney, Kerry. 



176. L. alienata Nyl. in Flora Ixii. p. 362 (1879).— Thallus 

 effuse, somewhat granular or leprose, unequal, thin, scattered,, 

 greyish-yellow (Kf -f yellowish, K(CaCl) + pale-tawny-reddish). 

 Apothecia minute, prominent, thinly margined, glomerulose- 

 connate, black ; paraphyses moderate, pale-bluish at the apices ; 

 hypothecium blackish; spores ellipsoid, 0,012-15 mm. long, 

 0,007-8 mm. thick ; hymenial gelatine scarcely tinged, but the 

 asci bluish then tawny, with iodine. — LitJiograjpha Larhalestiern 

 Leight. Lich. Fl. ed. 3, p. 394 (1879). 



Exslcc. Larb. Lich. Hb. n. 153. 



From its graphideine aspect referred by Leighton to Litlio- 

 qraplia. In the absence of spermogones its systematic place is 

 doubtful. The fructification constitutes irregular, scattered glome- 

 rules, each of which is composed of 12 or more apothecia. The 

 gonidia are either simple or subglomerulose. 



Hah. On moist schistose rocks. — B. M. Kylemore Lake, Galway. 



177. L. advertens Nyl. in Flora xlix. p. 419 (1866).— Thallu.s 

 indeterminate, thin, subfurfuraceous, byssoid, olive-black (K — , 

 CaCl — ). Apothecia minute, at length somewhat convex and 

 immarginate, black ; paraphyses concrete ; epithecium sordid- 

 bluish ; hypothecium black or brownish-black ; spores ellipsoid, 

 0,011-14 mm. long, 0,007-9 mm. thick ; hymenial gelatine bluish 

 with iodine. — Leight. in Ann. Mag. Nat. Hist. ser. 3, ix. p. 468 

 (1867) & Lich. Fl. p. 255; ed. 3, p. 251; Cromb. Lich. Brit, 

 p. 86. 



Associated with a cyanophyceous alga, and has the aspect externally 

 of Sjpilonema revei'tens. 



Hah. On calcareous rocks in maritime and subalpine tracts.^ — 

 Distr. Found only in Wales and N. W. Ireland. — B. M. Giltar Point, 

 Tenby, Pembrokeshire. 



178. L. segregans Nyl. in Flora xlix. p. 372 (1866).— 

 Thallus indeterminate, verrucose-granular, whitish or greyish- 

 white, the granules more or less segregate, or here and there 

 confluent ; hypothallus blackish, usually little visible. Apothecia 

 small, subplane, immarginate, at length convex, often aggregate- 



