Lecidea.] LICHENES. 127 



lamina proligera is a shallow, striated, colourless layer, lying on 

 much whitish matter, constituting the greater part of the apothe- 

 cium. 



44. L. vernalis, ACH. Thallus thin, filmy, somewhat pow- 

 dery, indeterminate, whitish-green or whitish ; apothecia minute, 

 losing their border, at length subglobose, crowded, somewhat 

 pellucid, dusky or reddish brown. Ach. L. Un. p. 198. Lichen 

 sphceroides, Dicks. Cr. Fasc. I. p. 9, t. 2,/. 2. Lecidea viridescens, 

 Hook. Eng. Flor. v. 5, p. 189, (not of Acharius). Lichen virides- 

 cens, Eng. Bot. t. 2217. 



On mosses, especially Hypna ; not uncommon. Mugeot and 

 Nestler's Lecidea viridescens, number 550, quite squares with Acha- 

 rius's description, in his Lick. Univ. p. 200, and is distinct from any 

 Irish specimen that I have seen. The structure of its " rugulose apo- 

 thecia'' is remarkable, for the lamina proligera, entire below, seems 

 divided above into a few irregular processes, corresponding to the 

 wrinkles on the surface of the disk. In our plant the disk under the 

 lens appears studded with dark points ; the lamina proligera is of 

 considerable thickness, pale, almost colourless, striated, having in the 

 centre of the globule a little opaque brownish matter. It invests the 

 surface of Hypna sometimes to the extent of several inches in dia- 

 meter. 



45. L. sulphurea, ACH. Thallus tartareous, smooth, cracked, 

 the edges of the cracks slightly raised, of a pale sulphur colour, 

 black-edged; apothecia at length emerging ; their disk at length 

 convex, blackish-olive, pruinose ; the proper border at length 

 obliterated. Ach. Syr), p. 37. Lecanora sulphurea, Ach. L. Un. 

 p. 399. Eng. Bot. M186. 



On siliceous rocks, Pigeon Island, Kenmare River ; near Belfast, 

 Mr. Templeton. A thallodal border to the apothecia is very observ- 

 able ; hence, perhaps, the shifting this species from under Lecanora to 

 Lecidea might have been omitted by Acharius. 



46 L. expallens, HOOK. Thallus between leprous and tarta- 

 reous, cracked, powdery, pale sulphur coloured, whiter and 

 thinner towards the border ; apothecia sessile, adpressed, convex, 

 and confluent ; the border losing its thallodal powder. Hook. 

 Eng. Flor. v. 5, p. 181. Lichen orostheus, Eng. Bot. t. 1549. 

 Lecanora expallens, Ach. Lich. Un. p. 374. 



On fir trees, at Derriquin, County of Kerry. This species too, 

 perhaps, ranges as well under Lecanora. The lamina proligera is 

 colourless and transparent. 



47. L. coronata, HOOK. Thallus tartareous, cracked, of im- 

 bricated, somewhat lobed granulations, olive-brown ; apothecia 

 crowded, flattish, at length convex, depressed, reddish-brown ; 

 their border narrow, crenate, flexuose. Hook. Eng. Flor. 5, p. 

 182. Eng. Bot. t. 1246 and t. 1247. Lecanora brunnea, Ach. 

 L. Un. p. 419. 



Near Belfast, Mr. Templeton ; near Bantry, Miss Hutchins ; on 

 rocks, at Blackwater Hill, County of Kerry. To the apothecia of 



