Rev. \V. A. Leighton on the British Graphidesc. 207 



Similar to the last, but the immersed lirellje are larger and 

 longer, confluent into irregular substcllate figures, with simple 

 ones interspersed, all surrounded with the peculiar whitish spu- 

 rious thallodal margin. 



7. elegansy Borrer MSS. Thallus pulverulent; lirellse larger, 

 simple and divided, prominent, wavy. 



On ash trees. Ardingley, Sussex ! Mr. Borrer, 

 Thallus subtartareous, pulverulent, cracked, uneven but not 

 so rugged as in the preceding varieties, of a pale tawny hue, 

 spreading in extensive patches. Lirellce very numerous, more 

 prominent, without the ocellate border, which however is occa- 

 sionally seen imperfectly at the very base, longer and larger, 

 linear, variable in size and length, simple or branched, elegantly 

 curved and wavy. Disk variable in expansion, but generally 

 broader, the proper margin, though still thick and rounded, 

 frequently more erect and visible. 



8. rubella, Thallus smooth ; lirellse prominent, immersed only 

 at the base. 



" Opegrapha rubella, Pers. Ust. Ann. Bot. st. 7. 1. 1. f.2. A. a. " (fide Ach.) ; 



Sehrader, Spicil. 17 j Heppe, Fl. Wurzburg. 73 (excellent) ; Fingerh. 



Fl. Eiffl. 22. 



rubella it, Ach. Meth. 21 (1803) ; L. Univ. 249. 



Lichen rubellus, Ach. Prodr. 22 (1798). 



Opegrapha herpetica, /3. disparata, Ach. Syn, 73 (1814), sec. specim. a 



Schairero in herb. Borrer ! 



rufescens, cc. rubella, Sch^r. Spicil. 60. 327 (1836); Exs. 95 ! 



atra, ^. siderella. Fries, L. Reform. 368. in part, according to the 



synonyms and Schaer. Spec. Exs. 95. quoted (1831). 



herpetica, cc. rubella, Schser. Enum. 155 (1850). 



" rufescens, Pers.," Bohler's Lich. Brit. no. 74. 



a. simplex, Lirellse simple. Opegrapha rubella, Cheval. Hist> 

 Graphid. p. 74. t. 17. fig. la; ^. decorticata, 74:, t. 17. f. 2; 

 h. albicans, 75. 1. 17. f. 4. 



On ash trees. St. Leonardos Forest and Charlton Forest, 

 Sussex ! Mr. Borrer. Berrow, south end of Malvern Hills, 

 "W^orcestershire ! Mr, E, Lees, Yorkshire ! Mr. G, Dixon, 



b. divisa. Lirellse substcllate. Opegrapha rubida, Cheval. Hist. 

 Graphid. 80. t. 18. f. 1 «, f . 2 b. Opegrapha crucianella, 80. 1. 18. 

 f. 3 c. 



On ash and birch trees. Sussex ! Mr. Borrer, Gopsall Wood, 

 Leicestershire ! Rev. A, Bloxam, 



Thallus thin, membranous, smooth, continuous, somewhat 

 shining, of a dark dingy olive, forming irregular patches bounded 

 by a thickened wavy brown margin. Lirellce scattered, promi- 

 nent, immersed only at the very base, linear, moderately long. 



