Lecanora.} LICHENES. 135 



On siliceous rocks, on Carig and Dunkerron mountains, County of 

 Kerry. Sometimes there is a black substratum observable. Some- 

 times the thallus is in scattered, tumid, minute, scarcely lobed warts. 

 When wet the thallus assumes a greenish hue, while the disk of the 

 apothecia becomes apparently more gelatinous. A little after the 

 opening of the globular scales that contain the apothecia, the disk of 

 these appear concave, but in the full grown it is always convex ; there 

 is more of a rose colour in the disk than in any of the congeners. 

 Dissection shows the entire of the lamina proligera to be of the same 

 colour throughout ; striated and sernipellucid ; from it the disk can 

 scarcely be distinguished as a separate layer. From the preceding the 

 lobed or crenate scales, the colour and convexity of the apothecia will 

 "keep the present distinct. While the same circumstances, besides the 

 thicker tartareous thallus, and want of the inflexed border to the full 

 grown apothecia will distinguish it from L. coarctata. The appear- 

 ances on dissection are very different from those of either of the two 

 foregoing species. 



8. L. glaucoma, ACH. Thallus tartareous, areolate, rough, 

 even, cream-coloured or greyish, determinate ; apothecia nume- 

 rous, convex ; their disk blackish, and pruinose, at length, of a 

 wax colour and flattish, and the border almost obliterated. Ach. 

 L. Un. p. 362. Eng. Bot. t. 2156. 



On rocks, on the shore at Bangor, near Belfast, Mr. Templeton ; 

 Blackwater Hill, County of Kerry. A black-olive edge is visible, 

 especially where two thatti of this species meet. The edges of the 

 areolcR are somewhat crenate : the areolce themselves are powdery on 

 the surface : the hue is often light-ochrey, or cream coloured. The 

 apothecia are frequently nearly globose, always pruinose when young ; 

 the dark disk at length drops off and exposes the lamina proligera 

 of a wax colour : dissection shows this last to be pale, striated and pel- 

 lucid, and of the colour stated. 



9. L. sabfusca, ACH. Thallus tartareous, thin, cracked, sub- 

 granulate, uneven, grey, with a paler or white border; apothecia 

 numerous, sessile, slightly convex, the disk brown or dusky, the 

 border at length crenate. Ach. L. Un. p. 393. Eng. Bot. t. 

 2109. 



On trees, most common ; on siliceous rocks, common ; on limestone 

 or mortar, more rare. The varieties on trees are 1, the common 

 appearance above defined : 2, with a very thin thallus, and very 

 pale and pruinose disk to the apothecia, as on birch and hollies j this 

 may be Lecanora angulosa, Ach. 3, with the thallus white, the 

 apothecia subpedicellated, their border singularly thick and wrinkled, 

 as also the backs, this occurs on oaks, at Askew wood, County 

 of Kerry. 4, the thallus almost filmy, investing, of a greenish 

 grey, in small patches, the apothecia minute, somewhat immersed ; the 

 disk pale, the border thick and entire ; on Salix cinerea in Askew 

 wood. There are besides, varieties on stone, of which the most re- 

 markable are 5, with a thin dirty white investing thallus, with the 

 areolce flat in the centre, somewhat crenate at the edges, and the bor- 

 der white, fibrous, and with a silky lustre : this occurs on rocks oc- 

 casionally inundated at Blackwater River, County of Kerry ; also, 

 larger in all its parts on siliceous stones on walls near Tralee. 6, on 



