Lccidca.] LIGHBNES. 121 



nulated and wrinkled, somewhat polished, ash-coloured, not 

 limited ; apothccia irregularly clustered, convex, at length con- 

 fluent and irregular. Ach. L. Un. p. 170. Eng. Bot. t. 155. 



On granite rock, at Lough Bray, near Dublin, Mr. Templeton. A 

 red tinge sometimes occurs within the cortical substance of the thallus, 

 and which communicates to so much of the crust as lies within the 

 apothecium. This colour, whence the Linnaean trivial name originated, 

 is by no means constant. The dissection in the Eng. Bot. does not 

 represent the lamina proligcra of a decidedly greenish hue, which 

 occurs in the Lough Bray specimens. 



21. L. muscorum, Hook. Thallus of scattered granules con- 

 nected by a very thin film; granules somewhat lobed, ash- 

 coloured ; apothccia crowded, black, at length very convex, and 

 the border obliterated. Hook. Eng. Flor. v. 5, p. 177. Eng. Bot. 

 t. 626, (bad.) 



On moss, on the mountains, near Belfast, Mr. Templeton. The 

 disk is thin and black ; the lamina proligera a very thin, dusky, 

 striated, scarcely transparent layer, resting on much blackish 

 matter, that occupies the greater part of the apothecium. 



22. L. viridi-atra, Ach. Thallus tartareous, cracked into 

 tumid, uneven, minutely granulated, pale, brownish-grey warts ; 

 apothccia on the warts, half immersed, black, at length very 

 convex, and with the border obliterated. Ach. L. Un. p. 166. 

 Eng. Bot. t. 1831. 



On rocks, near Belfast, Mr. Templeton. Our specimens correspond 

 with original ones of L. miscellus of Eng. Bot. Beneath the black 

 disk is a thick lamina proligcra, of a dark olive colour, striated, and 

 pellucid, resting on a thin layer of the same colour but more opaque. 

 The thallus does not appear to be determinate. 



23. L. scahra. Thallus tartareous, granulated, the granules 

 whitish, crowded, on a filmy greenish-grey substratum, rough, 

 minutely wrinkled, cracked ; apothccia black, immersed, irre- 

 gularly clustered and confluent, flat, at length somewhat con- 

 vex ; the disk rough ; the border smooth, entire, waved, at 

 length discharging its black colour. 



On siliceous rocks, on the shore at Derriquin, County of Kerry. 

 Patches sometimes three or four inches in diameter, having a sordid 

 greenish hue. Thallus not determinate, growing thinner towards the 

 edges. The granules are erect, somewhat stalked, at first entire, at 

 length broken on their tops, and there appearing white and powdery. 

 The border of the apothecia in many instances becomes pale through- 

 out its substance. Dissection shows a disk, consisting of a coarse 

 black pru ma, beneath which is a thick, greenish-grey, striated, pel- 

 lucid lamina proligera, resting on a layer of brownish matter. 



24.^L. geographica, Hook. Substratum of the thallus thin, 

 black, subtartareous, cracked, determinate ; the upper layer of 

 bright sulphur yellow, cracked, crowded, and subconvex scales, 

 sometimes somewhat lobed ; apothecia black, immersed between 

 the cracks of the scales, flat ; the disk rough ; the border rather 



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