LYGINODENDRON 



359 



sperms or Dicotyledons — a ring of collateral bundles, 

 forming secondary wood and bast by means of a 

 cambium. 



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Beyond the phloem-zone is a pericycle, containing 

 groups of thick-walled elements, like those which occur 

 in the pith. Embedded in the pericycle we find the 



