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 Riviniana 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 flecuosa) 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 
Y. 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 
