Secondary meristem: nm Meristem responsible for the growth in width of the tracheophytes. It appears in the post-germination period. It is first of all the libero-ligneous cambium or libero-ligneous generating zone giving the wood (secondary xylem), in internal position and with centrifugal differentiation, and the liber (secondary phloem), in external position and with centripetal differentiation. . Finally, there is the subero-phellodermal generating zone giving respectively the phelloderm (inter ...
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