76 LECANO-LECIDEEI [lECIDEA 



of which from Ben Lawers are in the British Museum. Nylander 

 states that the epitheoium usually turns reddish when moist. 



nab. On rooks in upland or mountainous regions. — Distr. Some- 

 what rare in S.W. and N. England, Wales, and W. Ireland, frequent- 

 on the Grampians, Scotland. — B. M. Cader Idris, Merioneth ; Cwm 

 Llugwy, Carnarvonshire ; Ben Lomond, Stirlingshire ; Stronachlabhan,. 

 Killin, Ben Lawers, Ben Vrackie, Craig Calliach, Glen Fender and 

 Craig Tulloch, Blair Athole, Perthshire; Achosragan Hill, Appin,' 

 Argyll ; Glen Callater and Morrone, Braemar, Aberdeenshire ; Apple- 

 cross, Bossshire. 



Form ochracea Nyl. Lich. Scand. p. 227 (1861). — Differs fromi 

 the type in the yellowish or rusty-red colour of the thallus. — 

 L. daphoena var. ochracea Ach. Lich. Univ. p. 166 (1810). L. 

 tessellata f. ochracea Cromb. Lich. Brit. p. 82 (1871). L. lapicida 

 var. ochracea Leight. Lich. Fl. ed. 3, p. 290 (1879). L. silacea 

 Ach. Meth. p. 48 (1803) pro parte; Engl. Bot. t. 1118 ; Hook, in 

 Sm. Engl. El. p. 178. 



Hcib. On rocks. — Distr. Somewhat rare in S.W. England, Wales 

 and Scotland. — B. M. Alternan, Cornwall ; Beddgelert, Llyn Geiron- 

 wydd, Carnarvonshire ; Glen Fender and Craig Tulloch, Blair Athole, 

 Perthshire ; Achosragan Hill, Appm, Argyll ; Morrone, Braemar,, 

 Aberdeenshire. 



129. L. plana Nyl. in Flora Iviii. p. 448 (1875).— Thallus. 

 effuse, thinnish, areolate-rimose, greyish- or glaucous-white (K— , 

 CaCl — , medulla I — ), often evanescent; hypothallus black. 

 Apothecia small, adnate, plane, thinly margined, usually crowded, 

 black, the margin entire ; paraphyses loosely coherent, narrowly 

 clavate and dark-brown or greenish-black at the apices ; hypothe- 

 cium colourless ; spores narrowly oblong, 0,009-1 2 mm. long, 

 0,0025-40 mm. thick ; hymenial gelatine deep blue with iodine.. 

 —Cromb. in Grevillea i. p. 173 ; Leight. Lich. Fl. ed. 3, p. 290. 

 L. lapicida subsp. lithophiloides Nyl. ex Cromb. Lich. Brit. p. 81 

 (1870) ; var. lithophiloides Leight. Lich. Fl. p. 285. Lecidella 

 •plana Lahm ex Koerb. Par. Lich. p. 211 (1861). 



Exsicc. Leight. n. 157 ; Mudd n. 178. 



Eesembles a small condition of the preceding, but is well distin- 

 guished by the persistently black apothecia and the narrower spores. 

 The thallus is somewhat variable, being either continuous, scabrid or 

 smoothish, or raore or less scattered ; at times granulate-verrucose 

 {ioinaperfectior Nyl. in Flora Ixiv. p. 539 (1881)), and not unfrequently 

 obsolete. The numerous apothecia are usually confluent and then 

 variously angulose or difform. 



Sab. On rooks and boulders, chiefly granitic and schistose in 

 mountainous regions. — Distr. Found only here and there in Central 

 and N. England, N. Wales and among the Grampians, Scotland. — 

 B. M. Near Buxton, Derbyshire ; Cader Idris, Merionethshire ; 

 Kildale Moor, Ayton Moor and Ingleby, Cleveland, Yorkshire ; 

 Camloohan, Forfarshire ; Ben Lawers and Stronachlachan, KilUn» 

 Perthshire ; Ben-naboord, Braemar, Aberdeenshire. 



