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abscission Amer anatomy angiosperms apertures apical arrangement axis become branch cambium carpels cavities cell wall commonly companion cells cork cortex cortical cross section cuticle cutinized cytoplasm diameter dicotyledons division elongate endodermis epidermal cells epidermis example extend face view fibers formation formed fruits function genera gymnosperms herbaceous increase initials inner intercellular spaces Jour lateral leaf traces leaves lenticels lignified longitudinal mature meristem meristematic mesophyll middle lamella monocotyledons morphological occur organs outer ovary parenchyma parenchyma cells pericycle periderm periderm layer petiole phellogen phragmoplast pith pits plasmodesmata plastids primary phloem primary wall primary xylem procambium protoplast protoxylem radial rays region root sclereids sclerenchyma secondary growth secondary phloem secondary tissues secondary wall secondary xylem seed shape showing sieve tubes species stages stele stem stomata strands structure substances surface tangential thick thickening tracheids transverse section usually vascular bundles vascular cylinder vascular tissue vessel elements woody plants xerophytic xylem and phloem