The Botany of Iceland - 01.12.1930, Síða 102
92
H. M0LMOLM HANSEN
trifidus, and Carex rigída\ some herbaceous plants likewise occur,
thus Polygonum viviparum, Thalictrum alpinum, Gatium boreale, Nor-
manni, and verum. The chamaephytes Vaccinium uliginosum and
Empetrum nigrum occur with as high an F.-percentage in the mo.
The mo is the typical Icelandic mo, with the same species
that occur elsewhere; selected at random the most conspicuous plants
are: Agrostis canina, Festuca rubra and ovina, Carex rigida, Poly-
gonum viviparum, Thalictrum alpinum, Galium boreale and Normanni,
Vaccinium uliginosum, Empetrum nigrum, Juncus trifidus, Luzula
spicata, Selaginella selaginoides, Elyna Bellardi, Thymns serpyllum,
Salix herbacea, Trisetum spicatum, and Silene acaulis.
The followdng essential difference betwreen the mo
and the forest-ground vegetation may be noted. The mo
vegetation is characterised by Ch and A species, the
forest-ground vegetation by H, especially grasses, and
E species. These differences wdll no doubt prove greater upon
closer investigation. The forest-ground at Norðtunga was non-ty-
pical in so far as a series of tjrpical forest ground plants such as
Fragaria vesca, Rubus saxatilis, Geum rivale, fírunella vulgaris, Trifo-
lium repens, Geranium silvaticum, Vaccinium myrtillus, Arctostaphylos
uva ursi, Calluna vulgaris and several others did not occur here.