APPENDIX I 



215 



2 THE PLANT FORMATION OF SILICEOUS SOILS (SILICION) 



Group of Associations 



Chief Associations Subordinate Associations 



Woods 



Scrub 

 Grassland 



Siliceous swamps 



Birch wood (Betuletum 



tomentosae) ' 

 Oak wood (Quercetum 



sessiliflorae) 



Siliceous grassland 

 (Nardetum strictae) 



Molinia grassland (Mo- 

 linietum caeruleae) 



Progressive scrub 

 Retrogressive scrub 



Siliceous grassland 

 with much 

 (a) UlexGallii 

 (6) Pteris aquilina 



(c) Agrostis tenuis 



(d) Deschampsia 



flexuosa 



(e) Juncus effusus 



or J. effusus 

 forma com- 

 pactus 

 (/) Calluna vulgaris 



Vegetation of swamps 



