176 LICHENES. [Lecidea. 



in E. Bot. Suppl. t. 2687. /. 1 /3. crust brown more level 



minutely cracked. 



On flints, which have been long exposed to the weather, Sussex 

 Downs. — /3. on a block of close-grained sandstone on the sea-.shore near 

 Rye, Mr. Borrer. — " The substratum of the lhallus is more obscure and 

 the warts are more minute and less distinct in L. prominula than in 

 L. atro-alba. The apothecia too are superficial, not sunk, as in that and 

 several other of the verrucose Lecidea, in the interstices of the warts. 

 Their scite, number and uniformly small size, give the plant some re- 

 semblance to L. jnnico/a, from which it differs widely in its thallus, as 

 well as in the place of growth ; nor indeed are the patelhilce so minute as 

 in that Lichen." Borr. 



11. L. chalybea, Borr. (metallic-black Lecidea); crust thin 

 leaden-black glossy at length somewhat tartareous minutely 

 cracked and opaque, apothecia superficial minute black, the disk 

 flat, the border slightly elevated entire. Borr. in E. Bot. 

 Suppl t. 2687. f. 2. 



On tiles and occasionally on flint, in various places in Sussex ; and 

 perhaps not uncommon elsewhere, since it is likely to be overlooked 

 among Leconora exigna and other minute Lichens, which form, in such 

 situations, the first crop of vegetation. Borr. 



12. L. premnea, Ach. (rough-bordered Lecidea^); crust thin 

 submembranaceous rather soft greyish, apothecia plane sessile 

 black, the disk internally cartilaginous and white, the border 

 elevated somewhat wrinkled at length flexuose. Ach. Syn, 

 p. 17. 



On trunks of trees, Mr. Borrer, (Sussex?). — I introduce this on the 

 authority of Mr. Borrer, not having seen a specimen, nor is it stated in 

 what part of England it is found. 



13. L. parasema, Ach. Meth. (common black-shielded Lecidea); 

 crust thin greyish uninterrupted somewhat granulated black- 

 edged, apothecia sessile flat opaque black with a black smooth 

 border at length convex. Sm. — Ach. Syn.p.17? — L.elceochroma, 

 Ach. Syn. p. 18. (" certainly" Mr. Borrer.) — Lichen parasemus, 

 E. Bot, t. 1450. 



On the smooth bark of trees, abundant. — Mr. Borrer refers our well- 

 known L. parasema to the L. elteochroma, Ach. Syn., (the L. parasema, 

 eltsoehroma, Lich. Univ. p. 275.) and he observes, " if L. parasema of 

 the Syn. be really distinct, I know not what it is." 



14. L. pinicola, Borr. Mss. (Pine-bark Lecidea); crust dif- 

 fuse thin brownish- white somewdiat tartareous, apothecia nume- 

 rous very minute very black opaque with a black smooth ele- 

 vated border. Sm. — Lichen pinicola, Ach. Meth. p. 66. E. Bot. 

 t. 1851. — Lecidea parasema, b. and d. Ach. Syn. p. 17 and 18, 

 (according to Mr. Borrer.) 



On the scaly bark of old Pine-trees. 



15. L. dubia, Turn, and Borr. Mss. (doubtful Board Lecidea); 

 crust leprous pale-brownish grey indeterminate, apothecia black 



