Rev. W. A. Leighton on the British Graphidese. 275 



Sussex ! Mr, Borr-er. On beech. New Forest, Hants ! Mr, Lyell 

 in herb, Borrer. Cultra, Co. Down ! On Spanish chestnut, 

 Knocknageney, Belfast ! Mr. W. Thompson. Oxfordshire ! Mr, 

 Baxter in herb. Dr, R. K. Greville. Berrow, Malvern Hills, Wor- 

 cestershire ! Mr. E. Lees. Donnington Park, Leicestershire ! 

 Rev. A, Bloxam. 



Thallus thin, subtartareous, continuous or cracked, smooth 

 and somewhat shining, pale yellow, or sometimes with a grayish 

 white pulverulent aspect, raised in irregular rugosities, especially 

 about the lirellse, which are uplifted by them, and forming spu- 

 rious thallodal margins more or less distinctly visible. Lirellce 

 very numerous and crowded, by their breadth and approximation 

 giving a very black appearance to the plant, moderately long, 

 some more elongated, but varying in length, either obtuse or 

 acute at the extremities, considerably raised above the thallus, 

 for the most part simple, though many branched at right angles 

 from the middle or near one end, flexuose and curved and wavy, 

 lying in all directions. Disk very wide, canaliculate, flattened or 

 hollowed more or less according to age, white with pruina, sur- 

 rounded by the very prominent, stout, elevated, curved and wavy 

 proper margin. 



"No. 91. Opegrapha scripta, €. serpentina, Schser/' Lich. Exsicc. 

 " ed. alt. immut.'^ in my copy is referable to this variety. 



fi, recta . Lirellse elongated, narrow, simple, horizontal and 

 parallel. 



Verrucaria typographical Willd. Flor. Berol. 370. t. 7- f. 14 (1787). 



Opegrapha recta, Humb. Fl. Freiberg. 57 (1793). 



** Cerasi, Pers. in Ust. Ann. st. 11. p. 20 " (fide Ach.) (1794); Ach. 



Meth. 27 ; Sm. E. Bot. t. 2301 (not 0. Cerasi, Pers. /. c, according 



to Martins, Fl. Brasil. I. c. infra). 



? Cerasi, DeCand. Fl. Fran9. ed. 3. vol. 2. 310. 



Lichen Cerasi, Ach. Prodr. 26 (1798). 



Graphis Cerasi, Ach. L. Univ. 268 (1810) (admirable description). 



scripta, y. Cerasi, Ach. Syn. 83 (1814). 



scripta, Meyer in Spreng.' Syst. Veg. 4. pt. 1. 262 (in part) (1825). 



Opegrapha scripta, jS. recta, Schaerer, Spicil. 46 (in part) (1823); Enum. 



151 ; Tuckermann, Syn. 7G (in part). 

 Graphis pulverulenta, e. orthograpta, Wallr. Fl. Crypt. Germ. 1. 331 (in 



part) (1831). 

 pulverulenta, recta, Martins, Fl. Brasil. 1. pt. 1. 71 (excl. O. macro- 



carpa, Pers., according to the fig. rather referable to our var. horizon- 



talis) (1833). 

 Opegrapha scripta, b. recta, Yv\Q%, L. Reform. 371 (in part) (1831); Summa 



Fl. Scand. pt. 1. 118 (in part); Hook. Br. Fl. 2. 147 (in part). 



On cherry and plum trees. Sussex ! Mr, Borrer. 

 Thallus thin, membranous, continuous, smooth, slightly 

 shining, pale yellow or straw-colour, in very elongated narrow 



18* 



