230 GRAPHIDBI [OPBGRAPHA 



0,006-8 mm. long, 0,002 mm. thick (fide Nyl. Lich. Par. p. 107 

 (1896)).— Engl. Bot. t. 1789?; Leight. in Ann. Mag. Nat. Hist, 

 ser. 2, xiii. p. 205, t. 5, f. 12a (1854) & Lich. Fl. p. 373 ; ed. 3, 

 p. 396 (incl. vars. vera and rubella) ; Mudd Man. p. 234 (inch 

 vars. vera and rufescens with var. ruhida pro parte) ; Carroll in 

 Journ. Bot. iii. p. 291 (1865) ; Cromb. Lich. Brit. p. 99 (incl. 

 va,r. disparata Ach. Syn. p. 73 (1814)). 0. rufescens Pers. in 

 Ust. Ann. Bof,. vii. p. 29, t. 2, f. 3a (1794) 1 ; Hook, in Sm. Engl. 

 Fl. V. p. 144 ?; Tayl. in Mackay Fl. Hib. ii. p. 105? 0. ruhida 

 Chev. Hist. Graph, p. 80, 1. 18, ff. 1 & 2 (1824). Lichen herpetics 

 Ach. Lich. Suec. Prodr. p. 20 (1798). Hysterina Jierpetica S. F. 

 Gray Nat. Arr. i. p. 506 (1821). B. disparata S. F. Gray I. c. 

 Exsiee. Leight. n. 221 ; Mudd n. 214. 



Hah. On trees. — Distr. Bather frequent throughout the British 

 Islands.— -B. M. Near Ilsham, Torquay, and near Exeter, Devon ; 

 near Lyndhurst, Hants ; Hockley Woods, Essex ; Charlton Forest, 

 Berks; Oxford; Derbyshire; Airyholme Wood, Easby Wood, Ayton 

 and Ingleby, Cleveland, Yorkshire ; near Cartland Crags, Lanarkshire ; 

 Dunkeld, Perthshire. 



Var. elegans Borr. ex Leight. in Ann. Mag. Nat. Hist. ser. 2, 

 xiii. p. 207 (1854). — Thallus slightly pulverulent or scurfy. 

 Apothecia small, curved and wavy, often stellate. — Mudd Man. 

 p. 235 ; f. elegans Leight. Lich. Fl. p. 374 ; ed. 3, p. 397. Var. 

 ruhida Mudd Z. c. pro parte. 



Exsicc. Leight. n. 286. 



Hah. On trees. — Distr. Somewhat rare in England and Ireland. — 

 B. M. Ivybridge and Ilsham, Torquay, Devon ; near Minstead, New 

 Forest, Hants ; St. Leonard's Forest, Sussex ; near Bath, Somerset ; 

 HoUybush Hill, Malvern, Worcestershire ; Airyholme Wood and 

 Ingleby, Cleveland, Yorkshire. 



Var. fuscata Sehser. Enum. p. 156 (1850). — Thallus dark, 

 dingy-olive, otherwise as in the species.^ 0. herpetica \ar. 

 rufescens Mudd Man. p. 235 (1861) (excl. syn.)', (& var. ruhida 

 Mudd I. c. pro parte) ; Cromb. Lich. Brit. p. 99 ; form rufescens 

 Leight. Lich. Fl. p. 375 ; ed. 3, p. 397 pro parte. O. ruhella 

 Pers. I. c. p. 31?; Sm. Engl. Fl. t. 2347 (1811) ; Hook, in Sm. 

 Engl. Fl. V. p. 144. Lichen ruhellus Ach. Lich. Suec. Pi'odr. 

 p. 22 (1798). 



Distinguished by the dark thallus. The species O. rufescens has 

 been restricted by Nylander (Lich. Par. p. 107 (1896) ) to forms similar 

 to O. herpetica, but with straight spermatia, 0,004-5 mm. long, 

 0,001 mm. thick, a character I have been unable to verify in any of 

 our British specimens. 



Hah. On trees. — Distr. Not uncommon in England and Wales. — 

 B. M. Cirencester, Gloucestershire; Chalkney Woods, White Colne, 

 Hadleigh Woods, Ulting, Hatfield Peverel and Epping Forest, Essex ; 

 Patcham, near Worcester ; Gopsall Wood, Leicestershire ; Suffolk ; 

 Ingleby, Yorkshire. 



