vit] MOORLAND ASSOCIATIONS 187 
The relationships of siliceous grassland and moorland may be 
shown in the following table :— 
Nardus grassland 
Dry facies Wet facies 
(Deschampsia flexuosa or (Juncus effusus 
Agrostis vulgaris abundant) abundant) 
Nardus grassland with Nardus grassland with 
much heather much cotton-grass 
Heather moor Cotton-grass moor 
TRANSITIONAL ASSOCIATION OF HEATHER Moor AND 
CoTTON-GRASS Moor 
Where the boundary between a heather moor and a cotton- 
grass moor is not marked by an escarpment, there is a wide, 
level or gently sloping zone in which the heather and the 
cotton-grass are co-dominant. These transitional areas are 
marked on the vegetation maps by stippling red dots over 
the colour used for the cotton-grass moor. A glance at the 
map will show that such areas are abundant and widespread, 
especially east of Derwent dale and south-west of Buxton. 
On many of the latter moors, the cross-leaved heath (Hrica 
Tetraliz) is very abundant. The majority of the associates 
of the heather moor are absent; and because of this fact, and 
because of the deep wet peat which occurs, the transitional 
moors have, on the whole, more in common with the cotton- 
grass moors than with the heather moors. Hence the ground 
colour chosen to indicate the transitional moors on the vegeta- 
tion maps is that used for the cotton-grass moors. The usual 
composition of the transitional moors (see figure 27) is given 
in the following list :— 
Sub-dominant 
Eriophorum vaginatum Calluna vulgaris 
Erica Tetralix 
Locally abundant 
Vaccinium Myrtillus Eriophorum angustifolium 
Rubus Chamaemorus Scirpus caespitosus 
Molinia caerulea 
