FIG. 13. Oak-birch heath association. Birch, Pyrus Aria, Beech 1 

 Heather, and Bracken. (From photograph by S. Mangham.) J 



JS ; 



FIG. 14. Heath association invaded by Pinus sylvestris. Heathef\ 

 and Furze. Pool with Potamogeton and Sphagnum, surrounded by j 

 Rushes. (From photograph by S. Mangham.) 



