232 GKAPHIDEI [OPBGRAPHA 



as 0. varia var. diaphora) ; Larb. Lich. Hb. n. 190 (as 0. atra 

 var. 



Distinguished from 0. herpetica by the longer, distinctly marginate 

 apotheoia and the usually reddish-brown colour internally. 



3ab. On trees. — Dist. Common throughout the British Isles. — 

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

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

 Hants ; Epping Forest, Hatfield Peverel, and Ulting, Essex ; Wor- 

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

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

 Lanarkshire ; Callander, Perthshire ; Killarney, Kerry ; Eostellan, 

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



Form ochrocheila Leight. Lich. FI. p. 377 (1871). — Apothecia 

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

 op. cit. ed. 3, p. 400. Opegrapha ochrocheila Nyl. in Flora xlviii. 

 p. 212 (1865). 



Hab. On trees, grass and rooks. — 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, arrariged in parallel 

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

 Var. parallela Mudd Man. p. 232 (1861). 



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



A growth form rather than a variety. 



Hob. On trees. — Distr. Bather 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 ; Killarney, Kerry ; 

 Killery Bay, Connemara, 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 ; Oromb. 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 

 stenocarpa \'ar. hapalea Ach. Lich. Univ. p. 257 (1810)). Hysterina 

 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. — 

 B. 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 Woods, 

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

 Merioneth ; Llanroohwyn and near Llandudno, Carnarvonshire ; near 

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

 Kerry. 



