92 H. MØLMOLM HANSEN 
trifidus, and Carex rigida; some herbaceous plants likewise occur, 
thus Polygonum viviparum, Thalictrum alpinum, Galium 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, Thymus serpyllum, 
Salix herbacea, Trisetum spicatum, and Silene acaulis. 
The following essential difference between 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 will no doubt prove greater upon 
closer investigation. The forest-ground at Nordtunga was non-ty- 
pical in so far as a series of typical forest-ground plants such as 
Fragaria vesca, Rubus saxatilis, Geum rivale, Brunella vulgaris, Trifo- 
lium repens, Geranium silvaticum, Vaccinium myrtillus, Arctostaphylos 
uva ursi, Calluna vulgaris and several others did not occur here. 
