32 LECANO-LECIDEEI [lECIDEA 



Forest, Hants ; Dartmoor, Devon ; Finchlcy and Millhill, Middle- 

 sex ; Pondlye and Enningham, Sussex ; Elstrce, Herts ; Gopsall 

 Park, Leicestershire ; Onibersley, near Worcester ; Bilsdale, Yorkshire ; 

 Appin, Argyll ; Glen Falloch, Craig Calliach, and ]^en Lawers, Perth- 

 shire ; Countesswells Woods, near Aberdeen ; Lairg, Sutherland. 



35. L. perobscura Nyl. in Flora Ivii. p. 9 (1874). — Thallus 

 effuse, thin, subopaque, black, brownish-black when moist (K — , 

 CaCl — ). Apothecia small, more or less scattered, somewhat 

 convex, immarginate, black, greyish within ; paraphyses coherent ; 

 epithecium brownish ; hypothecium colourless ; spores ellipsoid, 

 small, 0,006-8 mm. long, about 0,0035 mm. thick ; hymenial 

 gelatine bluish with iodine. — Cromb. in Grevillea ii. p. 140; 

 Leight. Lich. El. ed. 3, p. 308. 



The thallus is at times very thin, becoming nearly evanescent. It 

 is allied to L. uliginosa, but differs in the colour of the apothecia 

 internally, in that of the hypothecium and in the much smaller 

 spores. 



Hah. On an old fir paling in a wooded upland district. — B. M. 

 Near Killin, Perthshire (the only locality). 



36. L. epimarta Nyl. in Flora Ix. p. 226 (1877).— Thallus 

 effuse, minutely depressed-granulate, scattered, whitish (K -f 

 yellow, CaCl — ). Apothecia small, somewhat obconical, plane 

 above, narrowed below, immarginate, brown, usually rusty- 

 ochraceous-suffused, internally pale-dusky-ochraceous ; thalamium 

 somewhat ochraceous ; paraphyses slender, scanty ; hypothecium 

 thick, solid, nearly colourless or faintly ochraceous ; spores oblong, 

 minute, 0,006-9 mm. long, 0,0025-35 mm. thick ; hymenial 

 gelatine bluish then (especially the asci) tawny -yellow with 

 iodine. — Cromb. in Grevillea vi. p. 18; Leight. Lich. El. ed. 3, 

 p. 266. 



A small and singular species, readily distinguished from its more 

 immediate allies by the form and colour of the apothecia which are 

 somewhat crowded and prominent, appearing as if tuberculiform. As 

 observed by Nylander, the epithecial granulations on the application 

 of K are at once changed into raphides, a peculiar character of the 

 plant. The spermogones are not present in the single specimen, 

 which was associated with Pycnothelia ;papiUaria. 



Hah. On peaty soil in a subalpine district. — B. M. Achosragan 

 Hill, Appin, Argyll (the only locality). 



37. L. aestivalis Ohl. in Schrift. Phys. Ok. Ges. Konigsb. xi. 

 p. 16 (1870). — Thallus eff'use, thin, granulose, yellowish-green, 

 often evanescent. Apothecia small, convex, immarginate, brown- 

 ish, greyish-j^ruinose, colourless wdthin ; paraphyses indistinct ; 

 hypothecium colourless; spores fusiformi-oblong, 0,015-16 mm. 

 long, 0,005-6 mm. thick ; hymenial gelatine bluish then tawny- 

 wine-red with iodine. — Cromb. in Journ. Bot. xiv. p. 361 (1876) ; 

 Leight. Lich. El. ed. 3, p. 260. 



