STUDIES ON THE VEGETATION OF ICELAND 109 
TABLE 238. 
Biological Spectra of the Mo and Jadar Vegetation. 
1 2 1 4 5 6 7 8 9 | 10 
| —— | = = A = — = 
Points sum....... 1364 | 1572 | 1528| 1520| 1200| 1304| 1180| 1084| 1232 | 1208 
Number of species. | 35 36 3622235 35 | 40 30 38 | 42 39 
Density of species. || 13.6 | 15.7 | 15.3 | 15.2 | 12.0 | 13.0 | 11.8 | 108 | 12.3 | 12.1 
—— — — =] —= — =— — —= — ———m ——— — me 
ee | 69.2 | 75.2 | 74.1 | 73.2 | 65.0 | 71.2 | 52.5 | 64.2 | 61.0 | 66.2 
ER 30.8 24.7 | 25.9 | 26.8 | 35.0 | 28.8 47.5 | 35.8 | 39.0 33.8 
i eee | 37.5 | 36.6 | 41.1 | 40.3 | 41.7 | 40.8 | 19.5 | 35.4 | 36.7 | 38.4 
ee | 226 | 303 | 24.3 | 26.7 | 20.0 | 21.8 | 24.6 | 23.2 | 18.2 | 242 
MR 1... | 91| 84] 86| 63| 33] 86| 85| 55] 62| 36 
ee | 23.8 | 19.8 | 20.9 | 24.5 | 33.2 | 20.2 | 31.4 | 31.7 | 29.2 |27.8 
i. Se | 70! 48} 50| 24) 20) 67| 93| 15 .58| 46 
teers sk |» > >, >| 1) 18| 68| 26| 200 18 
El nue din a pe 0 6 0 0 6 ee | 2 » » » | » » » | » » | ) 
Bei... | 37.8 | 36.6 | 37.4 | 40.5 | 37.0 | 25.1 | 144 | 21.4 | 23.7 | 17.9 
|) eee 50.4 48.6 52.1 44.5 39.0 | 53.4 | 57.6 | 46.9 | 47.4 fee 
TT ue. | 11.7 | 13.7 | 10.2 | 15.0 | 24.0 | 21.5 | 26.3 | 29.5 | 28.6 | 28.5 
CESSE | » > | »- » | » | » | » » | » » 
x. | »| 10) 08 RENE EU ee EURE 
variegalum, and E. arvense. Botrychium Lunaria occurs singly but 
constantly. 
Thus to the above-mentioned physiognomic and biological dif- 
ferences between the level and the knolly mo must be added the 
following floristic differences: Salix glauca and Betula nana occur 
exclusively in the level mo. With a lower F.- percentage in the knolly 
mo we meet with Festuca ovina, Minuartia verna, Silene acaulis, and 
several others. Predominantly occurring in the knolly mo, we find: 
Loiseleuria procumbens, Agrostis canina, Trisetum spicatum, Poa alpina, 
Deschampsia flexuosa, Carex rigida, Rumex acetosa, Selaginella, Equi- 
selum variegatum, Bartschia alpina and several others. 
The two types of mo must thus be said to be well distinguished. 
The Jadar Vegetation. Cf. fig. 20 and table 23 A, 6—10. 
In depressions between the moraine walls, on the borders of 
the myrar, in small damp hollows in the mo, and as a fringe along 
the rivers the jadar vegetation is met with. When typically deve- 
