VII] MOORLAND ASSOCIATIONS 171 



Of these species, only Molinia caerulea and perhaps Scirpus 

 caespitosus occur in the fen formation of Cambridgeshire. 



5. The following species also occur (or formerly occurred) 

 in the fens of East Anglia : those that are local or very rare 

 are marked by an obelisk: 



Lathyrus palustris C. paradoxa 



t Viola stagnina C. lasiocarpa 



tV. montana C. lepidocarpa 



Peucedanum palustre C. pseudo-Cyperus 



t Selinum caruifolium Calamagrostis Epigejos 



tSenecio palustris tLuzula pallescens 

 t S. paludosus Orchis incarnata 



t Sonchus palustris Epipactis palustris 



Potamogeton plantagineus Habenaria conopsea 



Carex disticha + Liparis Loisellii 



The following plants are characteristic of British moors, 

 and are all common or fairly common plants : 



Lycopodium Selago Rhyncospora alba 



Blechnum spicant Carex curta 



Viola palustris C. echinata 



Drosera spp. C. binervis 



Galium saxatile Agrostis canina 



Arctostaphylos spp. Nardus stricta 



Vaccinium Oxycoccus Deschampsia Qexuosa 



Andromeda Polifolia Luzula multiflora 



Myosotis repens Narthecium ossifragum 



Pedicularis sylvatica Listera cordata 



Potamogeton polygonifolius Orchis ericetorum 



An opinion which is held by many geologists and others to 

 the effect that moor peat is generally composed of Sphagnum- 

 moss and fen peat of Hypnum-moss is not supported by an 

 examination of the plant remains preserved in the peat. 



Certain types of vegetation, intermediate in various respects 

 between moor and fen, require further study. They are usually 

 characterized by the presence of some of the following species : 



Myrica Gale Pedicularis palustris 



Ranunculus Lingua Schoenus nigricans 



Potentilla Comarum Triglochin palustre 



Parnassia palustris Eleocharis acicularis 



Anagallis tenella Scirpus pauciflorus 



Menyanthes trifoliata Eriophorum la tifolium 



Veronica scutellata Orchis latifolia 



