884 THE CRYPTOGAMIC FLORA OF KENT. 



P. PERLATA (L.). 



Common on trees, rocks, and walls. E. B. 841. Not observed 



in fruit. 

 Bexley ; Wrotliam ; Ightham ; Sevenoaks ; Penshurst ; Maid- 

 stone ; Wye. 

 Var. ciliata, DC. P. perforata, E. B. 2428. Hungershall Eocks, 

 with shields ; Jmner Fl. Tunhr. I observed this in 1877 

 in the same locality, but without fruit. On palings near 

 Lydd, in fruit ; Rev. J. M. Cromhie. 



P. PERFORATA, Wulf. P. reticulata, Tayl. 



On trees in damp shady woods, and in parks ; frequent. 

 Wood near Selling ; Hothfield Park ; Beechborough Park ; 

 Penshurst Park, abundantly ; Chilstone Park ; Broome 

 Park ; Hungershall AVood. 

 Closely resembles P. j^erlata in appearance, and probably often 

 overlooked for that species, but readily distinguished under a lens 

 by the minutely cracked surface of the thallus, and by the medulla 

 turning red when touched with solution of caustic potash. 



P. TiLiACEA (Ach.). 



On trees, especially those with a smooth bark. E. B. t. 700. 



Not observed in fruit. 

 Hill Park, near Westerham ; .Tenner Fl. Tunhr. Eynsford. 

 Var. scortea (Ach.), E. B. t. 2065. On a hovel at Hill Park, near 



Westerham ; Mr. Pi. Scott. Plaxtol ; Jenner Fl. Tunhr. 

 Var. rugosula, Leight. On trees, Ightham. 

 Very similar in the young state to P. Imvigata, but more closely 

 adherent to the bark, and with the segments rounded at the apex, 

 not forked, as in Iceviyata. 



P. L^VIGATA (Sm.). 



On trees, especially firs, rocks and walls, fi-equent ; not observed 

 in fi-uit. 



High Elms, near Chelsfield; Otford; Wroth am ; Willesboro' 

 Lees ; Wye ; Lenham. 



An exceedingly variable plant, often sorediate, but generally 

 distinguishable by its forked segments, and by being loosely 

 attached to the tree or rock. 



P. BoRRERi (Turn.). 



On trees; rare in fruit. E. B. 1780. 



On Tunbridge Wells Common, with shields, which are rare in 

 1837 ; and Mr. R. Scott finds it with them, very fine, in 

 Hill Park, near Westerham ; Jenner Fl. Tunhr. Eden- 

 bridge ; Tunbridge ; Sevenoaks ; Shoreham ; Wrotham ; 

 Ightham ; Bexley ; Maidstone ; Wye ; Ashford ; Postling ; 

 in fruit near Ashover Wood, Penshurst, in June, 1876. 



Known by the small white soredia scattered over the thallus. 



P. ACETABULUM (Xeck) ; P. corruijata (Jenner Fl. Tunbr.). 

 On trees in parks, &c. ; frequent in Kent. E. B. t. 1652. 

 On trees on Tunbridge Wells Common, without shields ; Jenner 



