322 



40 (b). P. polydactyla Hoffm. 

 Among mossos, common i R., !). 



41 (c). P. aphthosa (L.). 



Among mosses, hero and there (R., !). 



42. P. venosa (L.). 



Kai so: Blankeskaalefjæld (!). 



43. Nephroma lusitanicum (Schaer.). 



• In ravines and on ledges, here and there (R., !). 



All that I have seen from the Færoes under the name of N. 

 laevigatum, belongs to this species (medulla yellow, purplish when 

 treated with hydrate of potash). Its var. Hiherniciim Nyl. has also 

 been found (medulla white, purplish when treated with hydrate of 

 potash), giving room to the question; which is to be considered 

 most important, the natural colour or the artificial? The lusitanicum 

 is more common on all the Atlantic shores than laevigatum, but 

 perhaps it is not really a different species. 



44. N. tomentosum (Hoffm.). 



Among mosses. Vaago: Rensatinder C. .1.). 



45. Solorina cpocea (L.). 



On the ground in the mountains. Kalso: Blankeskaalefjæld (!); 

 Stromo: between Kalbakfjord and Skjællingtjæld (R.); Sydero: Axlen(R.); 

 Vaago: Rensatinder (R."!; Ostero: Rejafjældstindc f!\ Slattaretinde (R.l. 



46. S. saccata (L.). 

 Sporae 4-nae, 40 — 50 fj. 



On the ground. Sydero: Kvanhaugen (!), Trangisvaag (!). 



47. S. bispopa Nyl. 

 Sporae 2-nae, 70 — 80 /w. 



F u g 1 6 (!) ; Kalso: Blankeskaalefjæld (!) ; K u n 6 (!) ; Stromo: ravine 

 at Gjanore (!); Vide ro: Vedvig (!). 



Both S. saccata and S. bispora are found in Iceland. In Green- 

 land S. bispora is the more frequent. At Scoresby Sound there 

 occurs a var. octospora, otherwise quite similar to the others. S. bi- 

 spora has not usually a larger thailus and more urceolate apothecia 

 than S. saccata; the latter can vary from slightly impressed to 

 deeply urceolate. 



48. Sticta amplissima (Scop.). 



On large boulders with S. herbacea. Svino: near the village (!); 

 Ostero: Toftevatn (!). 



The interior of the sinus between the lobuli usually forms the 

 little circular aperture like that of a button-hole which is charac- 

 teristic of this species. 



