LECIDEa] LBCIDEACBaj 61 



0,0035 mm. thick. The thallus is intermixed with Sirosiphon 

 and Pyrenopsis sp. — L. subconfusa JSTyl. in Flora lii. p. 84 (1869); 

 Cromb. in GreviUea v. p. 27 ; Leight. Lich. Fl. ed. 3, p. 332. 



Bab. On siliceous rocks.— B. M. Tullywhee Bridge, near Kyle- 

 more, Connemara, Galway. 



99. L. arctica SommerL SuppJ. Fl. Lapp. p. 156 (1826).— 

 Thallus effuse, composed of minute, subglobose, papillose granules, 

 crowded or subdiscrete, whitish or brownish-grey (Kf + yellow, 

 medulla, CaCl + orange-red). Apothecia small, black, bluish- 

 pruinose or naked, convex, immarginate ; hypothecium pale- 

 brownish ; paraphyses indistinct, sordid-greenish-black towards 

 the apices; spores oblong or ellipsoid, 0,013-18 mm. long, 

 0,006-8 mm. thick ; hymenial gelatine slightly blue with iodine. 

 — Mudd Man. p. 200 ; Cromb. Lich. Brit. p. 79 ; Leight. Lich. 

 Fl. p. 273 ; ed. 3, p. 274. 



A high alpine species with an entirely northern distribution. 



Hab. On mosses in alpine districts.— Disir. On the high altitudes 

 of the Scottish Grampians. — B. M. Ben Lawers, Ben Vraokie and 

 Craig Calliach, Killin, Perthshire; Ben Maodhui and Lochnagar, 

 Braemar, Aberdeenshire. 



100. L. limosa Ach. Lich. Univ. p. 182 (1810).— Thallus 

 effuse, thin, furfuraceous, whitish-grey (K— , CaCl — ). Apo- 

 thecia black, adnate, convex or subglobose, immarginate ; 

 hypothecium colourless or pale-brownish; paraphyses thickish, 

 coherent, usually bluish-green at the apices ; spores elhpsoid, 

 fusiform-ellipsoid or oblong, 0,009—18 mm. long, 0,004—6 mm. 

 thick ; hymenial gelatine blue then sordid- wine-red or yellowish 

 with iodine. — Carroll in Journ. Bot. iv. p. 24 (1866); Cromb. 

 Lich. Brit. p. 79 ; Leight. Lich. Fl. p. 258 ; ed. 3, p. 252. L. 

 Wulfenii Mudd Man. p. 200 pro parte (non Hepp. fide CarroU). 



Exsicc. Cromb. Lich. Brit. n. 90. 



This species is nearly allied to the next, but the thallus is less 

 granular and the spores are shorter. 



Hab. On the earth in mountainous districts. — Distr. Local and 

 rare on the higher Scottish hills. — B. M. Canloohan, Forfarshire ; 

 Ben Lawers and Ben-y-gloe, Blair Athole, Perthshire ; Ben Cruachan, 

 Argyll ; Ben-naboord and Lochnagar, Braemar, Aberdeenshire. 



101. L. alpestris Sommerf. in K. Norske Vidensk. Skrift. ii. 

 p. 54 (1824-7). — Thallus effuse, thin, granular or minutely 

 warted-areolate, whitish or greyish on a whitish hypothallus 

 (gf ^ yellow, CaCl —). Apothecia appressed convex, immar- 

 gtQate, subconglomerate, black ; hypothecium colourless or pale- 

 brownish ; paraphyses coherent, dark brownish-blue-green at the 

 apices ; spores elongate-ellipsoid or oblong, 0,014-25 mm. long, 

 003-4 mm. thick ; hymenial gelatine blue then tawny-yellowish 



