114 THE VOYAGE OF H.M.S. CHALLENGER. 



Squamaria saxicola, Nyl. 



Squamaria saxicola, Nyl., Prodr., p. 70, et. Lich. Scand., p. 133 ; Leighton in Melliss's St Hel., p. 377. 



St Helena. Melliss. 



Widely spread in the Northern Hemisphere. 



Placodium murorum, DC? 



Placodium murorum, DC, Fl. Fr., ii. p. 378? Leighton in Melliss's St Hel., p. 377. 



St Helena. Melliss. 

 A widely disjtersed lichen. 



Lecanora personata, Leighton. 



Lecanora personata, Leighton in Trans. Linn. Soc. Lond., xxvii. p. 157, t. 35, et in Melliss's St Hel., 

 p. 377. 



St Helena. — Endemic. Burchell. 



Lecanora aurantiaca (Lightf.) 



Lecanora aurantiaca (Lightf.); Leighton in Trans. Linn. Soc. Lond., xxvii. p. 157, et in Melliss's St 

 Hel., p. 377. 



St Helena. Melliss. 

 Widely spread. 



Lecanora atra, Acharius ? 



Lecanora atra, Acharius, Lich. Univ., p. 344, et Synop. Lich., p. 143? Leighton in Melliss's St Hel., 

 p. 377. 



St Helena. Melliss. 

 A cosmopolitan species. 



Lecanora ferruginea, Nyl.? 



Lecanora ferruginea, Nyl., Prodr., p. 76, et Lich. Scand., p. 143? Leighton in Melliss's St Hel., ]>. .".77. 



St Helena. Melliss. 

 Widely spread. 



Lecanora argopholis, Acharius. 



Lecanora argophot is, Acharius, Lich. Univ., p. 346; Leighton in Melliss's St Hel., p. 377. 



St Helena. Melliss. 



Europe ; America ; New Zealand. 



