128 LICHENES. [Lecidea. 



this species, likewise, there is usually present a thallodal border. The 

 variety from Blackwater Hill is singularly pulvinate, has the lobes dis- 

 tinct, pruinose, their surface uneven, with a substratum to the thallus 

 dense, spongiose, brownish-black : the apothecia at first of a light 

 orange colour, afterwards brownish, always semi-transparent by mois- 

 ture. In a specimen from Observatory Inlet, north-west coast of 

 America, collected by Dr. Scouler, the lobes of the thallus are light- 

 brown, erect, fastigiate. 



48. L. quadricolor, Hook. Thallus leprous, dull grey, with 

 white, minute, somewhat tartareous granulations ; apothecia ses- 

 sile, minute, gelatinous, flesh-coloured, greenish or yellowish, 

 at length blackish ; the disk pruinose ; the border pale. Hook. 

 Eng. Flor. v. 5, p. 282. Eng. Bot. t. 1185. Lecanora granulosa, 

 var. a. Ach. L. Un. p. 384. 



On wet clay, near Belfast, Mr. Temphton. On bogs, near the 

 roots of heath, County of Kerry ; common. The apothecia may be 

 observed of more than four different colours. The buds appear in 

 large heaps, of a tawny colour, emitting a pale green powder. The 

 granulations of the thallus are greenish when wet. Beneath a prui- 

 nose disk is a semi-transparent, slightly coloured lamina proliyera. 



49. L. rupestris, Ach. Thallus tartareous, thin, contiguous, 

 indeterminate, grey or brownish-grey ; apothecia minute, half 

 immersed ; the disk reddish brown, at length convex ; the bor- 

 der at length obliterated. Ach. L. Un. p. 206. Lichen calvus, 

 Eng. Bot. t. 948. 



On limestone, near Belfast, Mr. Temphton. Dunkerron ; not un- 

 common. 



50. L. irrubata, Hook. Thallus between filmy and tartare- 

 ous, thin, dispersed, or collected and cracked, wrinkled, greenish- 

 grey ; apothecia somewhat immersed, flattish, of a dusky orange 

 colour, at length convex ; the border evanescent. Hook. Eng. 

 Flor. v. 5, p. 183. Lichen rupestris, Eng. Bot. t. 2245, (without 

 the synonyms.) 



On red sandstone, near Belfast, Mr. Temphton ; on mortar of a 

 wall near Tralee ; and on siliceous rocks at Blackwater, County of 

 Kerry. 



51. L. cornea, Ach. Thallus cartilagineo-membranaceous, 

 thin, white, smooth, determinate ; apothecia numerous, sessile, 

 reddish-brown, semitransparent; the border paler, thick, tumid, 

 entire, sometimes waved. Ach Meth. Lich. p. 36. Eng. Bot. t. 

 965. Lecidea carneola, Ach. L. Un. p. 1 94, the var. /3. cornea. 



On cherries at Powerscourt ; on ash at Dunkerron. 



52. L. ferruginea, Hook. Thallus tartareous, thin, some- 

 what cracked, uneven, greyish-white ; apothecia numerous, flat- 

 tish, at length scarcely convex, of a rusty orange ; the border 

 paler red, at length waved. Hook. Eng. Flor. v. 5, p. 184. Eng. 

 Bot. t. 1650. Lecidea cinereo-fusca, Ach. L. Un. p. 202. 



On siliceous rocks ; common. Too near the preceding. 



