vit] 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 
+ Viola stagnina C. lasiocarpa 
+ V. montana C. lepidocarpa 
Peucedanum palustre ©, pseudo-Cyperus 
+Selinum caruifolium Calamagrostis Epigejos 
+ Senecio palustris + Luzula pallescens 
+S. paludosus Orchis incarnata 
+ 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 flexuosa 
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 paucifiorus 
Menyanthes trifoliata Eriophorum latifolium 
Veronica scutellata Orchis latifolia 
