232 GItAPHIDEI [OPEORAPHA 



as 0. varia var. diapliora) ; Larb. Lioh. Hb. n. 190 (as 0. at/ a 

 var. ienuior). 



Pistinguishcd from O. hn-prdca by the longer, distinctly marginate 

 ai^otliecia and the usually roddisli-brown colour internally. 



Hah. On trees. — Dist. Common throughout the British Isles. — 

 B. M. Luxulion, Cornwall; I. of Wight; Beeding Windmill, Three 

 Bridges, CraWey, Mendon, and Saddlescomb, Sussex ; Eomsey, 

 Hants ; Epping Forest, Hatfield Pcverel, and tilting, Essex ; Wor- 

 cester ; Bath, Somerset ; Bala, Merioneth ; Trefriw, Carnarvonshire ; 

 Airyholme Wood and near Ayton, Cleveland, Yorksliire ; near Glasgow, 

 Lanarkshire ; Callander, Perthshire ; Killarney, Kerry ; Bostellan, 

 Cork ; Clonmel, Tipperary ; Adare, Limerick ; Killery Bay, Connemara. 



Form oehrocheila Leight. Lich. Fl. p. 377 (1871). — Apothecia 

 with ochraceous margins, the disc somewhat flattened. — Leight. 

 ojp. eit. ed. 3, p. 400. Opegrapha oehrocheila Nyl. in Flora xlviii. 

 p. 212 (1865). 



Hah. On trees, grass and rocks. — Dist. Bare in the Channel 

 Islands, England, and S. Ireland. — B. M. St. Peter's Valley, Jersey ; 

 Dinish, Killarney, Kerry. 



Form parallela Leight. Lich. Fl. p. 376 (1871).— Thallus thin, 

 greyish-white. Apothecia linear-elongate, arranged in parallel 

 lines, straight or flexuose. — Leight. Lich. Fl. ed. 3, p. 399. 

 Y&r. parallela Mudd Man. p. 232 (1861). 



Exsicc. Leight. n. 245 ; Mudd n. 209. 



A growth form rather than a variety. 



Hah. On trees. — Distr. Rather common in England, rarer in 

 Scotland and Ireland. — B. M. Withiel, Cornwall ; Torquay and Lust- 

 leigh, Devon ; Tilgate and near Glynde, Sussex ; near Lyndhurst, 

 New Forest, Hants ; Cirencester, Gloucestershire ; Alfrick, near 

 Worcester ; Ulting, Essex ; near Yarmouth, Norfolk ; Ludlow, Shrop- 

 shire ; Cockshaw Bank, Cleveland, Yorkshire ; Killarne^^ Kerry ; 

 Killery Bay, Cormemara, Galway. 



Var. denigrata Schser. Enum. p. 153 (1850) (excl. syn.). — 

 Thallus smooth, whitish, often determinate. Apothecia crowded 

 together and forming black patches on the thallus. — Mudd Man. 

 p. 232 ; Cromb. Lich. Brit. p. 98 ; f. denigrata Leight. Lich. Fl. 

 p. 376 ; ed. 3, p. 398 (incl. f. nigrata and f. hapalea Leight. II. c. ; 

 Lichen denigratus Ach. Lich. Suec. Prodr. p. 24 (1798). Opegrapha 

 sienocarpa var. hapalea Ach. Lich. Univ. p. 257 (1810)). Hysterino 

 denigrata S. F. Gray Nat. Arr. i. p. 507 (1821). 



Exsicc. Leight. n. 193 ; Mudd n. 210. 



Hab. On trees. — Distr. Common throughout the British Isles. — 

 jB. M. New Forest and Netley Abbey, Hants ; Chalford, Gloucester- 

 shire ; near Glynde and near Crawley, Sussex ; Hindlip and near 

 Malvern, Worcestershire ; Epping Forest, Ulting and Hadleigh AVoods, 

 Essex ; Wigmore, Herefordshire ; Long Priory, Shropshire ; Barmouth, 

 Merioneth ; Llanrochwyn and near Llandudno, Carnarvonshire ; near 

 Ayton, Cleveland, Yorkshire ; near Glasgow, Lanarkshire ; Killarney, 

 Kerry. 



