180 LICHENES. [Lecidea. 



Ach. Syn. p. 30. — Lichen abietinus, Ach. Prodr. — E. Bot. 

 t. 1682. 



On the bark of different species of Fir. 



34. L. speirea, Acb. (veiled black-shielded Lecidea); crust 

 tartareous uninterrupted slightly tessellated very white, apo- 

 thecia sessile flat covered with a grey hloom at length elevated 

 convex very black with a white (paler) border. Sm. — Ach. Syn. 

 p. 31. — Lichen speireus, E. Bot. t. 1864. — L. rimosus, E. Bot. 

 t. 1736, (according to Acharius). 



On flinty pebbles on the summits of the cliffs, near Newhaven, Sussex, 

 Mr. Borrer. 



35. L. albo-dtra, Borr. Mss. (black and white Lecidea); crust 

 spreading cracked somewhat mealy white, apothecia sunk even 

 with the crust small crowded black clothed with a grey bloom. — 

 u. corticola. Verrucaria albo-atra, Hoffm. PI. Lich. v. 1. p. 76. 

 t. 15. / 2. — Lecidea corticola, Ach. Syn. p. 32. — Lichen corti- 

 cola, E. Bot. t. 1892. — /S. saxicola. Lecidea epipolia, Ach. Syn. 



p. 32. — Lichen epip., E. Bot. t. 1137 L. candidus, E. Bot. 



t. 1138. (not Lecidea Candida, Ach.) 



«.. Old trees, frequent. /3. On stone buildings, Norfolk and Suffolk. 

 — At Mr. Borrer' s suggestion, I have referred the Lichen candidus of 

 E. Bot. to this (as an old state of it), united the Lecidea epipolia with 

 the L. corticola, and restored the old name of Hoffmann. The true 

 L. Candida of Ach. (Lichen tumidulus, Sin.) does not appear to be 

 British. 



36. L. Lightfootii, Ach. (Lightfootian Lecidea); crust tarta- 

 reous granulated greenish-white black-edged, apothecia sunk 

 flat at length convex polished black with a black smooth border. 

 Sm. — Ach. Syn. p. 34 Lichen Lightfootii) E. Bot. t. 1451. 



Bark of trees; not very unfreqnent. 



37. L. incompta, Borr. (loose mealy-crusted Lecidea); crust 

 indeterminate coarsely mealy uneven olive-green, apothecia 

 superficial small purplish-black the disk at length convex the 

 border narrow flexuose. Borr. in E. Bot. Suppl. t. 2699. 



In large patches, on the shaded parts of rugged trunks of old Elms, 

 at Shermanbury and Hurst-pierpoint, Sussex, Mr. Borrer. — "The 

 apothecia of this bear much resemblance to those of L. ceruginosa 

 and L. Lightfootii; but the thallus is essentially different in structure, 

 being formed, from the first, of coarse loose particles, not of granules, 

 scattered on a filmy substance." Borr. 



38. L. quernea, Ach. (Oak Lecidea); crust leprous pale 

 brownish-yellow, apothecia slightly immersed in the crust con- 

 vex dark-brown nearly black when dry, the border obsolete. 

 Ach. Syn. p. 36. — Lichen querneus, Dicks. Cr. Ease. 1. p. 9. 

 t 2. /. 3. E. Bot t. 485. 



In the clefts of the bark of Oak-trees, in exposed situations. 



39. L. viridescens, Ach. (greenish horny-tubercled Lecidea); 

 crust thin mealy indeterminate scattered pale-green, apothecia 



