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a Fleshy callus placed at the base of the epichile (SEM). b Magnification of a, callus built by polygonal cells with U-shaped cell walls. c Cross-section of callus with central groove and collateral vascular bundles in parenchyma (ad adaxial (inner) surface, ab abaxial (outer) surface, TBO). d Central groove of callus with bulges of distended cuticle (arrows) on secretory epidermis (se) (SBB)
