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tissue outside the middle column of the roots and stems
the
. It is immediately followed by the endosphere and usually consists
1
2
layer or multiple layers of thin-walled cells. Others contain thick-walled tissue. The mid-pillar is still retained with the ability to sub-life, by these cells can form side roots, indeterminate roots, infinitive buds, as well as a part of the formation layer and wood hydrant formation layer, so the middle column is also known as "surrounding formation layer." But this structure is missing from most seed plant stems.