342 THE cryptoga:\iic flora of kent. 



distiuguislied from P. faginea by giving no reaction either with 

 solution of potash or chloride of lime. 



P. LEIOPLACA (Ach.) 



On young oaks in woods and coppices ; frequent. 



Toy's Hill ; Ightham ; Thornden and BigbeiTy Woods, near 

 Canterbury ; Challocks Wood, near Wye ; Sibertswold. 



Known by its pale yellow or whitish smooth pohshed thallus 

 and scattered pustular apothecia. 



[P. pvstulata (Ach.), which closely resembles it, but is of a 

 greyish or greyish ohve colour, and contains usually more than one 

 apothecium in the verrucas, should be looked for on young oak 

 trees in Kent. Also P. melaleuca (Sm.) on holly or other trees. 

 It resembles P. leioplaca, but has much smaller and more numerous 

 verrucaB, which have the ostiola lacerate. The thallus also is of a 

 more decided yellow tint.] 



Phlyctis agel^a [Ach.) 



On trees in woods, &c. ; common. E. B. 1730. 

 Edenbridge ; Penshurst ; Ightham ; Sibertswold ; Newington ; 

 between Hythe and Lympne ; Sevenoaks ; Hungershall 

 Wood. 



P. ARGENA [Ach.) 



On trees ; frequent. Eare in fructification. 

 Ide Hill, near Sevenoaks; Penshurst; Joydens Wood; 

 Wrotham ; Sibei-tswold. In fruit at Biddenden ; Beech- 

 borough ; Selling ; Hungershall Wood ; and abundantly 

 near Hythe. 

 Known from P. agelcea by its thallus variegated with patches 

 of grey and white, and by the s]3ores not being mucronate at 

 either ends. 

 Thelotrema lepadinum, Ach. 



On old trees, rarely on rocks, in damp woods ; rare in Kent. 

 Ightham Common, on an old oak tree. 



Lecidea ostreata, Hofm. Lecidea scalaris (Jenner El. Tunbr.) 

 On old palings, rarely on trees ; fr-equent in Kent. E. B. 1501. 

 On trees on Tunbridge Wells Common, sterile ; Jenner Fl. Tunbr. 

 Keston Common ; Seal Chart; and Sandiidge, near Seven- 

 oaks ; Penshurst ; Westerham. 



L. Caradocensis, Leight. 



On old palings, especially near the ground. Ann. and Mag. 



Nat. Hist., Dec. 1864, t. 9, f. 6, 7, 10. 

 Seal Chart ; and Hill Park, near Westerham ; in fruit in both 



locaHties. 

 Known from L. ostreata by its darker colom-, smaller, and more 

 crowded scales, which are turned yellow by a solution of potash ; 

 also by its 1-3-septate spores. 



L. LUCIDA, Ach. 



In shady crevices in stone walls, and among rocks, &c., in 

 hedgebanks ; rare in fructification. E. B. 1550. 



