LECIDEA] LECIDEACBiE 83 



oblong, 0,006-9 mm. long, 0,0015 mm. thick. I follow Leighton's 

 suggestion in including the plant referred by Carroll to L. arcolata 

 Schaer. ; there is no specimen in the British Museum. 



Hab. On rocks and boulders, granitic and schistose, in mountainous 

 regions. — Distr. Not uncommon in N. Wales and among the 

 Grampians, Scotland ; rare in N. England and W. Ireland. — B. M. 

 Cader Idris and Moel Gader, Dolgelly, Merioneth; Twll Du, Nant 

 Francon, Carnedd Dafydd, Trefriw, and Llyn Geirionydd, Carnarvon- 

 shire ; near Winch Bridge, Teesdale, Durham ; Ben Cruachan, Argyll ; 

 Ben Lawers, Craig Tulloch, Craig Calliach and Ben Vrackie Perth- 

 shire ; Glen Callater, Braemar, Aberdeenshire ; Kylemore, Connemara, 

 Galway. 



Form Crombiei Nyl. in Flora liii. p. 38 (1870).- Thallus 

 sulphur-yellow or whitish-yellow. Apothecia innate, somewhat 

 convex; spores 0,010-12 ram. long, 0,006-7 mm. thick. — Cromb. 

 in Grevillea i. p, 173. L. Crombiei Jones ex Ny]. in Flora li. 

 p. 345 (1868); Cromb. in Journ. Bot. vii. p. 49 (1869), k 

 Lich. Brit. p. 82. 



Differs only in the colour of the thallus (which, however, becomes 

 darker in the herbarium), in the constantly innate apothecia and the 

 rather smaller spores. 



Hab. On rocks, granitic and schistose, in mountainous districts. — 

 Distr. Only a few localities in N. Wales, the Grampians, Scotland, 

 and W. Ireland. — B. M. Dolgelly, Merioneth; Craig Tulloch, Blair 

 Athole, Perthshire ; The Khoil, Glen Callater, and Morrone, Braemar, 

 Aberdeenshire; Mangerton, Killarney, Kerry; Doughruagh Mt., 

 Connemara, Galway. 



146. L. armeniaca Fr. Syst. Orb. Veg. i. p. 286 (1825); 

 Schaer. Spicil. pp. 126, 193. — Thallus subdeterminate, thick or 

 thickish, rimoso-areolate, the areolae plane or somewhat convex, 

 rugose, sometimes imbedded in the rock, yellow-ochraceous or 

 yellowish-red (K-h yellow, then crimson, CaCl — , K(CaCl — ); 

 hypothallus bluish-black. Apothecia innate, moderate, subplane, 

 or often convex, black, immarginate, dark within ; paraphyses 

 concrete, dark-olive-brown at the apices ; hypothecium colourless 

 or sordid; spores ellipsoid or oblong, 0,009-0,013 mm. long, 

 0,004-6 mm, thick ; hymenial gelatine deep-blue with iodine. — 

 Cromb. Lich. Brit. p. 83; Leight. Lich. Fl. p. 251 pro parte; 

 ed. 3, p. 243, pro parte. JRhizocarpon armeniacum DC. Fl. Fr. 

 ii. p. 366 (1805). 



Readily distinguished by the ultimate colour of the thallus and by 

 the thalline reactions. Represented in the British Islands by two 

 varieties, both of which, according to Nylander, grow together with 

 intermediate states on the mountains of Dauphine. 



Var. ^ aglaeoides Nyl. in Act. Soc. Sci. Fenn. vii. p. 401 

 (1863). — Thallus normally yellow or pale-ochroleucous, the areolae 

 usually rugose. Apothecia convex ; spores 0,009-0,013 mm. 

 long, 0,0045-55 mm. thick. — Cromb. Lich. Brit. p. 83. 



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