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 Eyjafjöröur (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. 
— panæola. — 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, Saxifraga 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. 
== castanea. 
Pertusaria oculata. 
Caloplaca Jungermanniæ. 
Psoroma Hypnorum. 
Lecidea assimilata. 
Bacidia flavovirescens. 
Buellia parasema (v. papillata and 
triphragmia). 
Rinodina mniaræa v. cinnamomea. 
Pannaria microphylla. 
Dermatocarpon hepaticum. 
Peltigera aphtosa. 
Solorina crocea. 
Cetraria Fahlunensis. 
— aculeata. 
— islandica. 
Alectoria nigricans. 
Cladonia turgida. 
— pyxidata. 
— rangiferina. 
— coccifera. 
Thamnolia vermicularis. 
Stereocaulon spp. 
