160 I. DISCOIDEI. 9, GRAPHIDEI. (crassa) 



ct. obscura (Lich. obscurus Sm. t. 1752. Arlhonia in 

 indice) ; crusta fusca, pulvinata; apotheciis punctiformibus. 

 — Ad corticem Quercuum Angliae Sm. Borr ! cujus speci- 

 men utramque varietatem jungit ; Galliae circa St. Sever 

 Dufour! 



/8. venosa (Op. venosa Sm. EB. t. 2454. non. Chev.) ; 

 crusta glauca vel cinereo-olivacea , apotheciis lineari- 

 elongatis. Exs. 587. Stigmatidium crassum Dub. 

 l)Ot. gall. 643. Moug. et Nesll ! exs. 955. — Ad corticem 

 Ilieis , Quercus, Fagi , Carpinorum in Gallia occident. Le 

 Prevost! in Brittannia , coll. Salic! 



Obs. Op. rugosam Spic. 52. 331. Exs. 99. 100. 

 Friesio duce ad Hysteria refero. 



