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E Epidermis Sk Hypodermis of sclerenchymatic cells S Guard cells A Arm-palisade parenchyma H Resin duct surrounded by epithelial cells En Endodermis. It surrounds a transfusion parenchyma with two vascular bundles (L) (with Xylem, x, and phloem, p) (R. DUDEN, 1985)