210 OLAF GALL0E 



Type I b. 



(Dry heaths with drifting soil; devoid of lichens 



Ex. 1. Heath on mountains between Fnjoskadulur and 

 Ej'jafjordur (North Iceland). 



Dryas F /o 100 Salix lanata F /o 20 



(ilumillorre F /o 100 Vaccinium uliginosum . . F /o 20 



Dwarf birch F /o 50 Lichens F o 



Empetrum F , o 40 



Type I c. 



(Dry heaths on level (not knolly) ground; heaths poor in phanerogams. 



hut rich in lichens). 



Ex. 1. Heath near Einarsta5ir (North Iceland). 



Dryas F /o 100 Dwarf birch F /o 10 



Glumiflorte F % 100 Silene acaulis F " o 10 



Empetrum F % 90 Lichens F o 100 



Ex.2. Heath near Myvatn (North Iceland). 



Dryas F /o 100 Dwarf birch F "/o 70 



Kmpetrum F /o 100 Vaccinium uliginosum . F o .~>0 



dlumiilore F o 100 Lichens F /o 100 



Type II. 



(Dry, knolly heaths with phanerogams on the horizontal surfaces of the knolls, 

 lichens on the sides of the knolls, mosses, etc., in the depressions between the knolls 



Ex. 1. The vegetation of the knolls on the heaths 

 near the Laxa (North Iceland). 



Kmpctrum F o 100 Dwarf birch F o 80 



Grasses F o 100 Lichens F o 100 



Ex. 2. The vegetation of the knolls on the heaths 

 near the Laxa, near Skjalfandi. 



Calluna F /o 100 Dryas F /o 40 



Kmpelrum F o 100 Dwarf willow F /o 20 



<i Hisses F ", o 100 Cyperaceae F . .. 20 



Arctnstophvlos F /o 80 Alchemilla alpina F o 20 



Dwarf birch F o 80 Mosses F ", o 60 



Vaccinium uliginosum.. F /o 80 Lichens F "/o 80 



Kx. I!. The vegetation of the knolls on ReykjahenM 



(North Iceland). 



Dwarf birch F /o 100 Salix lanata ... (a small amount) 



Vaccinium uliginosum. F/olOO Calluna (a small amount) 



Kmpcli-um F % 100 Mosses F /o 40 



.Imiiperus F % (JO Lichens F /o 40 



Grasses F " , o 60 



