bo 
— 
Or 
APPENDIX I 
2 THE PLant FORMATION OF SILICEOUS SOILS (SILICION) 
Group of Associations |. Chief Associations Subordinate Associations 
Woods Birch wood (Betuletum 
tomentosae) 
Oak wood (Quercetum 
sessiliflorae) 
Scrub Progressive scrub 
Retrogressive scrub 
Grassland | Siliceous grassland 
| (Nardetum strictae) 
Siliceous grassland 
with much 
(a) Ulex Galli 
(6) Pteris aquilina 
(ec) Agrostis tenuis 
(d@) Deschampsia 
flexuosa 
(e) Juncus effusus 
or J. effusus 
forma com- 
pactus 
(f) Calluna vulgaris 
Molinia grassland (Mo- 
liniétum caeruleae) 
Vegetation of swamps 
Siliceous swamps 
