Rev. \y. A. Leightoii un (he Brtiis/t Graphideae. 273 



simply or doubly bi-anched, or frequently with lateral branches, 

 terminating in curved acuminate points, immersed in and slightly 

 prominent above the rugosities of the thallus. Disk rather widely 

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

 nose, surrounded by a stout elevated margin, verj' irregular in 

 its width from alternate contraction and dilatation, singvdarly 

 and peculiarly waved and crisped. 



The specimen on oak of " Xo. 91. Opegrapha scripta, e. ser- 

 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, cii'cumscribed by a brown wavy line. Lirellte 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, 8. spathea, Ach. L. Univ. 2/0 (1810); SjTi. 84. 

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



On beech. St. Leonard's 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, pai'tially circumscribed by 

 an irregular wavy brown line. LirelUe numerous and scattered, 

 but not crowded, though approximate, moderately long, though 

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

 scattered in all directions, cuiTed 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 rimscform, 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. Borrer's copy of Schaerer's Lich. Exsicc. 1st edit., 

 " No. 87. Opeyrupha scripta, a. limitata, A. Sch?er. ;" " No. 88. 



Ann. ^- Mag. N. Hist. Scr.2. Vol. xiii. 18 



