The Botany of Iceland - 01.12.1930, Page 119
STUDIES ON THE VEGETATION OE ICELAND
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Table 23 b.
Biological Spectra of the Mo and Jaöar Vegetation.
1 2 3 4 5 6 7 8 9 10
Points sum 1364 1572 1528 1520 1200 1304 1180 1084 1232 1208
Number of species. 35 36 36 35 35 40 30 38 42 39
Density of species. 13.6 15.7 15 3 15.2 12.0 13.0 11.8 10 8 12.3 12.1
A . .. 69.2 75.2 74.1 73.2 65.0 71.2 52.5 64.2 61.0 66.2
E . .. 30.8 24.7 25.9 26.8 35.0 28.8 47.5 35.8 39.0 33.8
A 3 37 5 36.6 41.1 40.3 41.7 40.8 19.5 35.4 36.7 38.4
A 2 22 6 30 3 24.3 26 7 20.0 21.8 24.6 23 2 18.2 24.2
A 1 9.1 8.4 8.6 6.3 3.3 8.6 8.5 5.5 6.2 3.6
E 4 23.8 19 8 20.9 24.5 33.2 20.2 31.4 31.7 29.2 27.8
E 3 7.0 4.8 5.0 2.4 2.0 6.7 9.3 1.5 5.8 4.6
E 2 » » » » » 1.8 6.8 2.6 3.9 1.3
E 1 » » » » » » » » * *
Ch 37.8 36.6 37.4 40.5 37.0 25.1 14.4 21.4 23.7 17.9
H 50.4 48.6 52.1 44.5 39.0 53.4 57.6 46.9 47.4 51.0
G . . . 11.7 13.7 10.2 15.0 24.0 21.5 26.3 29.5 28.6 28.5
HH » » » » » » » » » »
Th » 1.0 0.3 » » » 2.5 2.2 0.3 2.3
variegalum, and E. arvense. Botrijchium Lunaria occurs singly but
constanlly.
Thus to the above-mentioned physiognomic and biological dif-
ferences between the level and the knolly mo must be added the
following íloristic diíferences: 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, Sitene acaulis, and
several others. Predominantly occurring in the knolly mo, we find:
Loiseleuria procumbens, Agrostis canina, Trisetum spicatum, Poa alpina,
Beschampsia flexuosa, Carex rigida, Rumex acetosa, Selaginella, Equi-
setum variegatum, Bartschia alpina and several others.
The two types of mo must thus be said to be well distinguished.
The Jaðar Vegetation. Cf. fig. 20 and table 23 A, 6—10.
In depressions between the moraine walls, on the borders of
the mýrar, in small damp hollows in the mo, and as a fringe along
the rivers the jaðar vegetation is mel witli. When typicallv deve-