Rev. W. A. Leighton on the British Graphidese. 95 



Proper margins thick, tumid, prominent, rounded and inflexed, 

 entire and uniform, persistent. 

 Plate Y. fig. 9. Sporidia. 



p. notha, Ach. Lirellse round or oblong, deformed; disk 

 plane or convex, obliterating the proper margins. 



OpegrapTia lichenoides, Pers. Ust. Ann. Bot. st. 7. p. 30, t. 2. f. 4, a, b 



(1794). 

 Uclien nothus, Ach. Prodr. 19 (1798). 

 Opegrapha notha u. Sf ^, Ach. Meth. 17 (1803). 

 notha, Sm. E. Bot. t. 1S90 (1808) ; Ach. L. Univ. 252; a, Syn. 76; 



Wahl.. Fl. Carpat. 391 ; Fl. Upsal. 449 ; a. Fl. Suec. 859 ; DeCand. 



Fl. Fran?, ed. 3. 2. 310; Mart. Fl. Erlang. 278. m pait; Grev. Fl. 



Edin. 353 ; Heppe, Fl. Wurzb. 75 ; Fingerhuth, Eiffl. 24 ; Moug. & 



Nestl. Stirpes, 857- 

 » cymbiformis, /3. lichenoides, Schaer. Spicil. 51. 330 (1823-1836); 



Exs. 282 ! 

 GrapMs notha, WaUr. Crj-pt. Germ. 336 (1831). 

 Opegrapha varia, h. notha. Fries, L. Ref. 364 (1831). 



varia, Hook. Br. Fl. 2. 145. in part (1836). 



varia, /3. notha, Tuckermann, N. Lich. 75 (1848); Leight. Lich. Bht. 



Exsic. 66 ! 

 varia, x. lichenoides, Schaer. Enum. 156 (1850). 



On oak. Sussex ! Mr. Borrer. High Vawr Lane, Oswestry, 

 Shropshire ! Rev. T. Salwey. Moutford Bridge near Shrewsbury, 

 Shro}) shire ! 



Thallus effuse, thin, pulverulent, white. Lirella numerous, 

 scattered and congregated, large, very prominent and sessile, 

 various in size and fonn, generally of a round, oblong, or linear- 

 oblong shape, obtuse at the extremities, simple and straight, 

 opake black. Propei' margins very narrow, almost obliterated by 

 the expansion of the broad plane or tumid and convex disk. 



Not to be confounded with Lecanactis hjncea, nor with Lecidea 

 alho-atra, var. corticola, from which the different sporidia keep 

 it distinct. 

 Plate V, fig. 9. Sporidia. 



7. diaphora, Ach. Lirellse elongated, attenuated at both ex- 

 tremities ; disk plane ; proper margins persistent, flexuose. 



" Opegrapha varia, Pers. Ust. Ann. Bot. st. 7. p- 30" (fide Ach.) (1794). 

 Lichen diaphorus, Ach. Prodr. 20 (1798), sec. specim. ab Achario seipso in 



herb. Borrer ! 

 Opegrapha diaphora », Ach. Meth. 19 (1803); L. Univ. 254; Mart. Fl. 



Erlang. 279. 



notha, 9. diaphora, Ach. Sju. 77 (1814). 



cymbiformis, y. hebraica, Schaer. Spicil. 51. 330 (1823-1836); Exs. 



981519! 

 .^ varia, d. diaphora. Fries, L. Reform. 365 (1831); Hook. Br. Fl. 2. 



145. in part. 



varia, 8. diaphora, Tuckermann, N. Lich. 75. 



varia, d. diaphora «§r c. chlorina, Schser. Enum. 157. 



On oak. Sussex ! Mr. Borrer. 



