126 LICHENES. [Lecidea. 



pose, is the L. amylacea of Ach. Moisture gives the thallus a green- 

 ish hue. The dissection in Lich. Un. tab. 2, f. 1, does not accord 

 with that of the Irish plant, and, as it gives no distinct lamina proli- 

 (/era, perhaps it is incorrect. The lens shows the disk studded with 

 closely set, dark points, beneath which is the lamina proligera, 

 brownish-grey, striated, and semi-transparent, resting on black matter. 

 I have seen Irish specimens, collected by other botanists, of L. epi- 

 polia, Ach. and of his L. corticola, but neither, could I satisfy myself, 

 to be distinct from the present species. 



40. L. quernea, Ach. Thallus leprous, brownish-grey, with 

 olive-grey, rotund, scattered granulations; partly covered with 

 buds in a coarse, dilute, dusky, yellow powder ; apotkecia some- 

 what immersed, convex, confluent and irregular, of a purplish 

 deep-brown ; the border evanescent. Ach. L. U. p. 202. Eng. 

 Bot. t. 485. 



On old oaks, near Belfast, Mr. Templeton. The apothecia are 

 frequently clustered, swelling much by moisture. Beneath a thick 

 dark brown disk, is observable the lamina proligera, sub-pellucid, of a 

 redder or more lively brown, resting on a very thin layer of dusky 

 matter. 



41. L. pulverea, Boiut. Thallus thin, between filmy and 

 tartareous, brownish-grey, rugged, cracked, indeterminate ; the 

 surface nearly covered with buds in a soft, pale, coarse, greyish- 

 green powder : apothecia sessile, black, often confluent, scattered ; 

 the border livid, slightly raised, at length evanescent. Borr. in 

 Eng. Bot. Supp. t. 2726. 



On old oaks, at Dromore, County of Kerry. The disk is rather 

 thick and black ; the lamina proligera dusky, yet pellucid and 

 striated, resting on a shallow layer of dark brown matter. Our 

 specimens exhibit a sub-stratum of the thallus to the powdery 

 buds. 



* * Apothecia not black. 



42. L. incana, Hook. Thallus leprous, very mealy, soft, 

 uneven, glaucous-grey, at length whitish-grey ; " apothecia scat- 

 tered, sessile, brown, with a paler brown, even, smooth border." 

 Hook. Eng. Flor. v. 5, p. 181. Lepraria incana, Ach. L. Un. p. 

 665. 



On decaying turf, at Colin glen, near Belfast, Mr. Templeton. The 

 apothecia have not yet been met with in Ireland. 



43. L. luteola. Ach. Thallus thin, between filmy and tarta- 

 reous, slightly granulated, indeterminate, greenish-grey ; apo- 

 thecia sessile, at length convex, of a tawny flesh colour or 

 brownish, the border at length evanescent. Ach.L. Un.p. 195. 

 Lichen vemalis, Eng. Bot. t. 845. 



On elms, at Dunkerron ; on rocks, at Derriquin, County of Kerry. 

 The thallus varies in thickness, being thinner and more powdery on 

 trees; on rocks, at Derriquin, it is almost tartareous, somewhat rugged ; 

 at Glentiesk, smooth, soft, and whitish. The disk appears dotted, the 



