LICHENOLOGY OF ICELAND 231 



The mountain is 790 metres high. The species found there were 

 not, however, collected on the summit itself which is almost 

 inaccessible - but yet not far below it. 



On Sulur, near EyjafjorSur (height about 1400 metres), I found 

 the steep mountain summit free from snow on July 5th, 1913. The 

 summit itself was almost devoid of lichens; there occurred only a 

 few specimens of: 



Lecanora polytropa. Lecidea fuscoatra. 



varia. Siebenhaariana. 



(Aspicilia) gibbosa. Rhizocarpon geminatum. 

 Caloplaca vitellina. geographicum. 



elegans. Parmelia lanata. 



pyracea. Gyrophora erosa. 



cerina. arctica. 



Lecidea auriculata. Usnea melaxantha. 



On detached blocks of rock and on smaller rock-fragments im- 

 mediately below the summit, there occurred: - 



Lecidea lapicida. Caloplaca vitellina. 



confluens. Pertusaria oculata. 



subconfluens. Parmelia lanata. 

 panaeola. saxatilis. 



Lecanora gibbosa. Cetraria Fahlunensis. 



varia. Gyrophora cylindrica. 

 polytropa. erosa. 



badia. hyperborea. 



Rhizocarpon geographicum. 



On loose soil there occurred a scattered desert (rocky-flat-) 

 vegetation, consisting of a few plants of Dryas, Silene acaulis and 

 some other species (Ranunculus glacialis, Sa.rifraga oppositifolia) and 

 a little moss; intermixed with this vegetation occurred some lichens, 

 which grew exclusively on the mosses, and were quite absent from 

 the purely inorganic soil. The following species were found: 



Lecanora tartarea. Peltigera aphtosa. 



castanea. Solorina crocea. 



Pertusaria oculata. Cetraria Fahlunensis. 

 Caloplaca Jungermanniae. aculeata. 



Psoroma Hypnorum. islandica. 



Lecidea assimilata. Alectoria nigricans. 



Racidia flavovirescens. Cladonia turgida. 

 Ruellia parasema (v. papillata and pyxidata. 



triphragmia). rangiferina. 



Rinodina mniarsea v. cinnamomea. coccifera. 



Pannaria microphylla. Thamnolia vermicularis. 



Dermatocarpon hcpaticum. Stereocaulon spp. 



