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The stage IV stem illustrated here shows an outer covering of periderm with fine strips of fibres formed from the secondary phloem.
Potato tuber native periderm and immature wound periderm were very similar in basic organization.
They are well known to occur in plant/atmosphere interfaces where they form water-tight barriers such as the leaf cuticle and suberized periderm .
Seed plants produce wood and periderm through secondary growth.
They were observed 6-7 layers below the suberized periderm and in the tuber portion far from the buds.
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