56 VEGETATION OF THE PEAK DISTRICT [CH. 



ground vegetation. The following ground species may also 

 be expected to occur: 



Nephrodium dilatatum Digitalis purpurea 



N. Filix-mas (local) Galium saxatile 



Pteris aquilina Campanula rotundifolia 



Rumex Acetosella Hieracium boreale 



Potentilla erecta (local) Holcus mollis 



Arenaria trinervia Deschampsia flexuosa (local) 



Polygala serpyllacea Anthoxanthum odoratum 



Viola Eiviniana var. diversa Poa trivialis (local) 



Conopodium majus Carex pilulifera (local) 



Teucrium Scorodonia Luzula pilosa 



Lamium Galeobdolon Scilla non-scripta 



(4) Places where acidic humus is present in good 

 quantity. The oak remains dominant: the birch and the 

 mountain ash are often abundant : the wych elm and the 

 ash are rare or absent : shrubs are rather rare and sometimes 

 almost absent; whilst heathy dwarf shrubs, especially the 

 bilberry, are typically abundant (see figures 3 and 7). Ground 

 species with showy flowers are rare : the soft-grass (Holcus 

 mollis) is local and often absent ; but the silver hair-grass (Des- 

 champsia flexuosa} becomes exceedingly abundant : the bracken 

 varies from being very abundant to very rare. This type of 

 vegetation was termed by Woodhead (1906 : 347) a " xero- 

 Pteridetum." It is characterized by the following species: 



Nephrodium dilatatum Digitalis purpurea 



Blechnum spicant Melampyrum pratense 



Pteris aquilina var. montanum 



Potentilla erecta var. hians 



Ulex Gallii (local) Galium saxatile 



Cytisus scoparius (local) Solidago Virgaurea 



Lathyrus montanus Hieracium vulgatum (local) 



Polygala serpyllacea Holcus mollis (local) 



Pyrola media (v. rare) Deschampsia flexuosa 



P. minor (rare) Molinia caerulea (local) 



Calluna vulgaris Carex binervis 



Vaccinium Myrtillus C. pilulifera 



V. Vitis-idaea (local) Luzula pilosa 



Teucrium Scorodonia L. multiflora 



The two last-mentioned types of ground vegetation occupy 

 by far the major portion of the woodland area, and they have 



