186 VEGETATION OF THE PEAK DISTRICT [CH. 



footpaths, in typical examples of the association of Eriophorum 

 vaginatum of the southern Pennines : 



Dominant 

 Eriophorum vaginatum 



Locally sub-dominant 

 Molinia caerulea Eriophorum angustifolium 



Locally abundant 



Empetrum nigrum Vaccinium Myrtillus 



Erica Tetralix Scirpus caespitosus 



Calluna vulgaris Carex curta 



Local or rare 



Andromeda Polifolia Pinguicula vulgaris 



Vacciuium Oxycoccus Agrostis canina 



Narthecium ossifragum 



TRANSITIONAL ASSOCIATION OF COTTON-GRASS MOOR AND 

 SILICEOUS GRASSLAND 



It has been already stated that parts of the siliceous grassland 

 show transitions to the heather moor : such places have a com- 

 paratively dry soil. Some wet parts of the siliceous grassland 

 show analogous transitions to the cotton-grass moor. This 

 transitional association is characteristic of wet and stagnant 

 hollows. The mat-grass (Nardus stricta) is less abundant here 

 than on typical siliceous grassland ; and the moor grass (Molinia 

 caerulea) is frequently conspicuous. Juncus squarrosus is some- 

 times very abundant ; but in all cases one or other of the two 

 cotton-grasses, generally E. angustifolium, is the most prominent 

 plant. Such areas in the Peak District are local in their dis- 

 tribution. Perhaps the best of them occur between Hayfield 

 and Chinley. The association probably represents a stage in 

 the development of cotton-grass moor from siliceous grassland. 

 On the vegetation maps, they are shown by printing the word 

 " peat " on the colour used for siliceous grassland 



