130 LICHENES. \Lecidea. 



border is observable on old apothecia in Fries' specimens, number 41 

 of his Lich. Suec. exsiccati. 



58. L. erythrella, HOOK, Thallus tartareous, rather thin, 

 orange, uneven, cracked into angular warts, determinate ; the 

 border very thin, investing, entire, of a paler hue ; apothecia 

 minute, crowded, sessile, at length convex; the disk of a deep 

 orange ; the border paler, entire. Hook. Eng. Flor. v. 5, p. 

 186. Eng. JBot. t. 1993. 



On limestone at Dunkerron, County of Kerry ; also at Tralee. Our 

 specimens, which accord with the English Botany figure and descrip- 

 tion, differ remarkably from the preceding species by the nature of the 

 border to the thallus. Besides the proper margin to the apothecia, a 

 spurious thattodal exterior rim is usually observable. This species has 

 a strong affinity to Lecanora elegans. I know not where to refer, if 

 not to this species as its very young state, a Lecidea common on our 

 limestone, whose apothecia are more minute, more pale, and whose 

 thallus is in so thin a layer as to be nothing more than a citron-coloured 

 very fine powder. 



59. L. picta. Thallus leproso-tartareous, very thin, brown- 

 ish-grey, minutely wrinkled, continuous, or scarcely cracked, 

 rugged, determinate ; apothecia minute, numerous, crowded, 

 half immersed, very concave ; the disk of a pale greenish dun 

 colour, with a bright yellow pruina ; the border very tumid, 

 inflexed, of a bright yellow. 



On siliceous slate, Dunkerron mountain, and elsewhere in the 

 County of Kerry. The thallus is elevated into minute acute wrinkles 

 or roundish pieces, whose edges are whitish and shining ; when moist, 

 under the lens greenish points appear. The apothecia concave, almost 

 urceolate when dry, by the application of moisture have their disk ele- 

 vated to nearly or altogether the level of their border. The border is 

 commonly quite entire, yet sometimes slightly jagged. The opening 

 of the apothecia is usually compressed, hence the border is waved. 

 The lamina proligera is deep, and has upright strife ; it is colourless 

 and pellucid. The patches are sometimes a foot or more in length. 

 To the naked eye only a yellowish suffusion of the surface of the rock 

 appears. It might be considered closely allied to Lecanora vitellina 

 if it were not for the very different crust and dissimilar structure of the 

 apothecia. 



f f Thallus subcrustaceous, or scaly > lobed. 



Under this head may have been arranged some species of the pre- 

 ceding section, with a black substratum and dispersed warts to the 

 thallus. It comprehends the PSOR^: of Hoffman. 



60. L. canescens, ACH. Thallus tartareous, lobed at the 

 edges, orbicular, plaited, white, with a glaucous powder in the 

 centre ; apothecia central, depressed, black, with a narrow bor- 

 der. Ach. L. Un.p. L>16. Dill Muse. t. 18,/. 17, A. Dicks. 

 Cr. Fasc. I. p. 10, t. 2, /. 5. Eng. Bot. t. 582. 



On tress, near Belfast, with apothecia, Mr. Templeton ; at Rath- 

 ronane, County of Tipperary, Mr. G. S. Gough ; on walls common, 

 but barren. 



