78 LBCANO-LBCIDEBI [lECIDEA 



133. L. tephrizans Leight. in Trans. Linn. Soc. ser. 2, i. 

 p. 257, t. 32, figs. 3 and 4 (1878).— Thallus almost obsolete, only 

 a few whitish depressed scattered areolse remaining (K — , 

 CaCl — ); hypothallus predominating, blackish-grey. Apothecia 

 black, numerous, plane or slightly concave, prominent, sessile, 

 with a thickish margin eventually obliterated ; hypothecium 

 blackish-brown subtended by a pale-greyish-blue hyaline exci- 

 pulum, the hymenium thin, pale-greyish-blue ; paraphyses distinct, 

 conglomerate, blackish at the tips ; spores narrowly ellipsoid, 

 minute, 0,009-10 mm. long, 0,005 mm. thick; hymenial gelatine 

 dirty-blue with' iodine ; spermatia minute, shortly cylindrical, 

 straight. — Leight. Lich PI. ed. 3, p. 311. Specimen not seen. 



Hah. On hard slaty rocks. — Distr. Eare in Wales and W. Ireland. 



134. L. lactea Floerke ex Schaer. Spicil. p. 127 (1812).— 

 Thallus yellowish- white or ashy-grey, thin, smooth, cracked- 

 areolate, the areolae plane (K-f- yellow, then deep orange-red). 

 Apothecia numerous, scattered or aggregate, innate, plane, naked 

 or pruinose with a thinnish prominent entire or flexuose margin ; 

 hypothecium dark-brown ; paraphyses distinct somewhat clavate 

 and greenish-black at the apices ; spores ellipsoid, 0,012-15 mm. 

 long, 0,005-7 mm. thick ; hymenial gelatine bluish with iodine, 

 — Cromb. Lich. Brit. p. 83; Leight. Lich. Fl. p. 289; ed. 3, 

 p. 295. L. ambigua Pr. Lich. Suec. Exs. n. 407; Stenh. Sohed. 

 Grit. xiv. p. 11 (1833) (non Ach.) ; Mudd Man. p. 206 pro parte. 



Exsice. Leight. n. 301 ; Johns, n. 351. 



The smooth thallus and innate apothecia with prominent margin, 

 resembling somewhat those of Lecanora Dicksoni/i, give a distinctive 

 character to this species. It differs from L. plana in the dark 

 hypothecium and the somewhat larger spores. The apothecia are 

 sometimes immersed and the surrounding thallus is broken away. 



Hah. On rooks in maritime and mountainous districts. — Distr. 

 Somewhat rare in N. Wales, N. England, E. and N. Scotland, and 

 S. W. Ireland. — B. M. Cader Idris, Dolgelly, and Barmouth, Merioneth ; 

 Trefriw and Capel Curig, Carnarvonshire ; Cwm Ffynon, Flint ; near 

 Thirsk, Yorkshire ; Camlochan, Forfarshire ; Portlethen, Kincardine ; 

 Achosragan Hill, Appin, Argyll ; Ben Lawers, Perthshire ; Morrone, 

 Braemar, Aberdeenshire ; Mangerton, Kerry. 



135. L. subkochiana Cromb. in Journ. Bot. ix. p. 179 (1871). 

 — Thallus crustaceous, smooth, whitish or greyish, determinate, 

 cracked-areolate, the areolae plane, contiguous (K+ yellowish 

 then red, CaCl — ). Apothecia black, numerous, innate or sessile 

 with a prominent margin ; hypothecium colourless or pale- 

 brownish ; paraphyses dark-brown at the tips ; spores ellipsoid, 

 small, 0,008-12 mm. long, 0,005-6 mm. thick ; hymenial gelatine 

 blue with iodine. — Leight. Lich. Fl. ed. 3, p. 295. L. tessellata 

 f. gubhochiana Nyl. in Flora lii. p. 85 (1869). 



The apothecia resemble in outward form those of L. lactea, but 

 differ in the lighter hypothecium and the somewhat smaller spores. 



