lbcidea] lecideacbje 81 



The thallus grows in small more or less insulated patches, and is 

 at times associated with L. polycarpa. The apotheoia, at length 

 slightly prominent, are usually numerous on the thalline patches. 

 The spermogones, solitary or congregate and somewhat prominent, 

 are frequent, with spermatia cylindrical, straight, 0,006-7 mm. long, 

 scarcely 0,001 mm. thick. 



HaA. On schistose rocks in mountainous regions. — Distr. Eare on 

 the Scottish Grampians. — B. M. Ben More, Perthshire ; Cairn Turc, 

 Braemar, Aberdeenshire. 



141. L. illita Nyl. in Flora Ixii. p. 356 (1879).— Thallus 

 effuse, thin or very thin, applanate, cracked-areolate, the areolae 

 angulose, yellowish-brown or pale-greyish (K(CaCl)-f reddish, 

 medulla CaCl-f reddish) ; hypothallus very thin, umbrine-black. 

 Apothecia minute, innate, margined, umbonate in the centre, 

 black ; paraphyses slender, scanty ; perithecium and umbo 

 brownish-black in thin section ; hypothecium thin, almost 

 colourless; spores ellipsoid, 0,012-16 mm. long, 0,008-0,011 mm. 

 thick ; hymenial gelatine tawny-wine-reddish with iodine. — 

 Cromb. in Grevillea viii. p. 112. Specimen not seen. 



Differs from the preceding in the thalline reaction. Apothecia 

 1 or 2 in each thalline areola; the spermogones have the 

 spermatia acicular, 0,005-6 mm. long, 0,0005 mm. thick, on simple, 

 moderate sterigmata. It has been detected at Mozi in Japan {vide 

 Nyl. Lioh. Jap. p. 75), with larger spores, 0,014-20 mm. long, 

 0,009-13 mm. thick. 



Hab. On argillaceous schist at Clifton, Somersetshire. 



142. L. alumnula Nyl. in Flora lix. p. 574 (1876).— Thallus 

 determinate, thin, white (K — , CaCl — );' hypothallus black, 

 limiting the thallus. Apothecia minute, subinnate, plane, 

 margined, often subumbonate in the centre, black ; paraphyses 

 concrete, brownish-black at the apices ; hypothecium brownish- 

 black ; spores ellipsoid, 0,009-0,012 mm. long, 0,005-6 mm. 

 thick; hymenial gelatine bluish, the asci at length pale-wine- 

 coloured with iodine. — Cromb. in Grevillea v. p. 107 ; Leight. 

 Lich. Fl. ed. 3, p. 302. 



Frequently grows in sublobula'te patches on the thallus of 

 L. conUgua. Our specimens are well fertile, with the apotheoia at 

 times subconfluent. 



Hah. On quartzose rocks of a stream in an upland district.— 

 B. M. Base of Diamond Mt. and Letterfraok, Connemara, Galway 

 (the only locality). 



143. L. limborina A. L. Sm. — Thallus thin or obsolete, 

 effuse, blackish or greyish, slightly rimulose. Apothecia small, 

 black, adnate or appressed, centrally umbonate or tuberculate, 

 the margin tumid, incurved and uneven ; hypothecium dull- 

 brown ; paraphyses indistinct, becoming black and carbonaceous 

 at the tips ; spores ellipsoid, colourless becoming brown, 0,018- 



II. G 



