STUDIES ON THE VEGETATION OF ICELAND 5a 
TABLE 128. 
Biological Spectra of the Valllendi Vegetation. 
1 2 3 4 > 6 
SE SUTIN esse wer ae 0 | 684 | 680 668 736 652 
mumber Of species: .- .\....... 19 21 15 16 15 17 
Bensıty OF SPECIES; 25%. 5. re 6.7 6.8 Ge 0067 7.4 6.5 
ie so PR RE ER 38.7 33.3 15.9 | 14.4 17.4 92 
ON UE at 61.3 66.7 84.1 85.6 | 82.6 90.8 
Be nassen SE 18.5 16.4 15.9 | 132 17.4 | 8.0 
EEE hare 0.6 0.6 > | u > 48 | > 
i eee 19.6 | 164 Wily walkout oa) 3 | 1.2 
re Cr nan 232.1. 91.6 15.3 | 15.6 16S 6 208 
SEE NE RE 13.7 15.8 224 | 24.6 22 16.0 
he 24.4 27.5 AI E3LEt, 44.0 52.1 
Ra ere count > 923128 | kr 0.5 DK 
eee eee 292 | 211 | ; 18 | 05 | 06 
ee seen 46.4 58.5 81.2 86.8 723 | 81.6 
ee EEE 20.2 20.5 | 18.8 11.4 271.2, We SUES 
> . OE eee > » | > | » » | » 
Does CR APE a A Pore 4.2 » > | > > > 
difference between this type, the jadar vegetation, on the one hand, 
and the mo and myri vegetations on the other hand, to set it up 
as a type of the same standing as these. Much would seem to in- 
dicate that this is the case. Thus it is a factor of some importance 
that it appears as a very characteristic feature of the landscape in 
the highland tracts. Deschampsia cespitosa, Poa pratensis, and Agrostis 
tenuis are characteristic species on jadar soil. Types of Icelandic 
vegetation included herein are valllendi, tin, and myri jadar. The 
very remarkable flag vegetation is always associated with it, but 
owing to very divergent physiognomical, biological, and floristic pe- 
culiarities it must be set up as a special type of vegetation. 
On Lyngdalsheidi the jadar vegetation was represented by vall- 
lendi and myri jadar. 
The Valllendi Vegetation. Cf. fig.8 and table 12 A—B. 
On the numerous small flat cones deposited by the streams of 
melting snow, occurring partly in Lyngdalur and partly scattered 
about throughout the heath, a characteristic vegetation, the valllendi 
