H38 



156 (b). B. sororia Th. Fr. 



S and 6: Grothusvatnj. 



The two preceding diller only in the reaction of the medulla 

 when treated with iodine (presence of starcii) and oiight perhaps 

 more properly to be iinited under one name. B. urceolata Th. Fr., 

 parasitic on various crusts (H.), must be considered as a Leciographa. 



157. B. alboatra var. epipolia (Ach.). 

 Stromo: Ruin of the cliurch in I\irkebo (!). 



158. B. geographica (L.). 



On roclcs and stones. Ratlier common (R, !). 



159 (a). B. petraea Wulfen. 

 On rocks. Common (R, !). 



All the specimens from the Færoes are Rhizocarpon ohscuratam 

 according to the nomenclature of Th. Fr. 



160 (b). B. amphibia (Fr.). 



On rocks that are often wet. S^dero: Vaag Ejde (!). 



161 (c). B. calcarea (Weis.). 



On basaltic rocks. Sydero: Yaag (!). 



162. B. Oederi (Ach.). 

 Stromo (R.). 



c. Graphideae. 



163. Opegrapha atra var. calcarea Turn. 



Stromo: the redoubt at Thorshavn (!); Sj^dero: Famien (!). 

 f. virescens Nyl. 



Skud R. ; Sydero: Skaalefjæld, Famien (R.). 



164. O. vulgata f. lithyrga Nyl., Stizenb. 



On basaltic rocks. Sydero: Vaag, in a ravine (!). 

 It has the aspect of O. herpetica\ Spores fusiform, 4 — 8 septate, 

 18—20 (i. 



165. Arthonia radiata (Pers.). 



On trees in gardens at Thorshavn (R.). 



166. A. lapidicola Tayl. 



On rocks on Sydero (R.). 



d. Verriicarieae. 



167 (a). Dermatocarpon miniatum (L.). 

 Here and therc on rocks (R., !). 



