Rev. W. A. Leighton on the British Graphidese. 273 



simply or doubly branched, or frequently with lateral branches, 

 terminating in curved acuminate points, immersed in and slightly 

 prominent above the rugosities of the thallus. Disk rather widely 

 canaliculate, even when diy, more expanded when wetted, prui- 

 nose, surrounded by a stout elevated margin, very irregular in 

 its width from alternate contraction and dilatation, singularly 

 and peculiarly waved and crisped. 



The specimen on oak of " No. 91. Opegrapha scripta, e. 5^- 

 pentina, A. Schser.'^ in Mr. Borrer's copy of 1st ed. of Schserer's 

 Lich. Exsicc. is referable here. The other specimen on beech 

 belongs to our G. diffracta. No. 91 of "edit. alt. immut.'' on 

 beech is eutypa, Ach. The sporidia prove them to be forms of 

 G. serpentina. 



6. stellata. Lirellse stellate. 



On ash. Sussex ! Mr. Borrer. 



Thallus thin, membranous, pale olive, continuous, smoothish, 

 sometimes a little roughened with minute scattered tubercles, 

 elevated into a thin membranous spurious margin about the 

 lirellse, circumscribed by a brown wavy line. Lirellce distant, few 

 and scattered, arranged in small irregular star-like groups, ex- 

 tremities of the rays or branches rather acute, slightly raised 

 above the thallus. Disk rimseform or slightly canaliculate when 

 dry, more expanded when moistened, and surrounded by a rather 

 thick stout proper margin. 



L. spathea, Ach. Lirellse moderately long, simple, curved, 

 numerous, scattered in all directions, approximate. 



Graphis serpentina, d. spathea, Ach. L. Univ. 2/0 (1810); Syn. 84. 

 scripta, Moug. & Nestl. Stirpes, 650 ! (1820). 



On beech. St. Leonardos Forest, Sussex ! Mr. Borrer. 



Thallus thin, subtartareous, continuous, pale yellow, rough- 

 ened with minute tubercles or rugosities, elevated about the 

 lirellse into narrow spurious margins, partially circumscribed by 

 an irregular wavy brown line. Lirellce numerous and scattered, 

 but not crowded, though approximate, moderately long, though 

 .varying exceedingly in size, some longer, some shorter, lying 

 scattered in all directions, curved and wavy, simple, immersed in 

 the spurious margins, though elevated a little above their level, 

 obtuse or obtusely pointed at the extremities. Disk in a dry 

 state rimseform, nearly closed by the stout rounded incurved 

 proper margins, which when wetted are narrow, surrounding in a 

 wavy, more or less crisped state, the expanded disk which is 

 destitute of pruina. 



In Mr. Borrcr^s copy of Schserer's Lich. Exsicc. 1st edit., 

 " No. 87. Opegrapha scripta, a. limitata, A. Schser. >" " No. 88. 



Ann. ^ Mag. N, Hist. Ser. 2. Vol. xiii. 18 



