666 A. HESSELBO : THE BRYOPHYTA OF ICELAND 



the North-west, whilst they are absent from, or rare in, the other 

 districts of the country. To this group belong: Dicranella cerviculata, 

 Dicraniim Blyttii, D. elongatum (western part of N. Iceland around 

 Hunafloi; NW. and W, Iceland), Ditrichiim homomalliim (common in 

 the South-west), Isotheciiim tenuinerve, Rhynchostegiiim riisciforme, 

 Hypniim hamiilosiim and Hylocomiiim parietiniim. Finally, Diplo- 

 phylliim albicans is characteristic of all the lava-fields of West and 

 South-west Iceland. 



