12-1 LICHENES. [Lecidea. 



their young state only. The disk rough, opaque, nearly black ; the 

 lamina proligera shallow, whitish brown, semi-pellucid, striated, resting 

 on white cortical matter, that forms the great proportion of the con- 

 tents of the apothecium. 



52. L. uliginosa, Ach. Thallus thin, somewhat filmy, most 

 minutely granulated, dark olive-brown, cracked, indeterminate; 

 apothecia black, minute, rather crowded ; their disk somewhat 

 rough, flat, at length convex ; their border indistinct. Ach. L. 

 Un.p. 180. Eng. Bot. t. 1466. 



On the wet surface of turf or clay ; not uncommon. An inconspi- 

 cuous species, requiring close inspection for its detection. Beneath a 

 black disk rests the lamina proligera, in a thin, slightly brownish, 

 striated, pellucid layer, lying on much brownish-black matter, that forms 

 the principal part of the apothecia. 



33. L. geomcea. Thallus with the inferior layer filmy, of a 

 brownish-grey; the upper of tartarcous, minute, rotund, crowd- 

 ed granulations, of a slightly greenish-white ; apothecia black, 

 globose, smooth, at length confluent; the border evanescent. 

 Lee. uliginosa, 7. geomcea, Ach. L. Un. p. 180. 



On moss, near Belfast, Mr. Templeton ; on turf, on stems of furze 

 and of heath, near Dunkerron, County of Kerry. Granulations smooth 

 or uneven, green within. Apothecia larger than the granulations. 

 The synonym is taken from a specimen named by Acharius for the late 

 Mr. Harriman, and sent by the latter to Mr. J. Mackay. The greatest 

 peculiarity of this species is discovered by dissection, for beneath a 

 disk consisting of black points contiguous or with pellucid interstices, 

 is found a lamina proligera, in a narrow layer of a sea-green colour, 

 resting on much pale-brownish pellucid matter. 



34. L. lapidicola. Thallus of minute, roundish, flat, scatter- 

 ed scales, aggregated towards the centre of the patch, of a 

 tawny-brown, with greyish summits ; apothecia minute, nume- 

 rous black, rugged, round or oblong ; the disk tumid when 

 moist; the border evanescent. 



On slate rock, County of Down, Mr. Templeton. On stones, on 

 the bridge wall at Cappamore, near Dunkerron, Kerry. There is, in 

 the dry and young apothecium, an angular circumscription, but no dis- 

 tinct border, hence this species might arrange under Arthonia, did not 

 all analogy forbid it. Dissection shows the disk black ; beneath it the 

 lamina proligera, in a thin, whitish, pellucid, striated layer, resting on 

 brownish-black matter, twice as thick in depth ; below all a greyish 

 substance may be observed analogous to the cortical part of the 

 thallus. 



35. L. simplex, Hook. Thallus filmy or subtartareous, thin, 

 smooth, olive-brown, scaling away, indeterminate ; apothecia 

 olive-black, numerous ; their disk concave, rather rough, flat- 

 tish ; their border raised, smooth, entire, at length waved and 

 contorted. Hook. Eng. Flor. v. 5, p. 179. Eng. Bot. t. 2512. 



On siliceous slate, Dunkerron ; not uncommon. The patch is often 

 several inches in diameter. The apothecia crowded or dispersed, but 

 always numerous ; sometimes the young growing out of the old. 



