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1 Parenchyma cells remain alive at maturity and can become meristematic, as in INTERFASCICULAR CAMBIUM (see SECONDARY THICKENING). See Fig. 246 2  . 2 the loose, vacuolated cells that form much of the body tissue of platyhelminths.  3 any specific organ cells apart from connective tissues and blood vessels.
Dedifferentiated parenchyma cells produce Cork cambium. It lies in the outer part of the cortex (fig.1). It produces cork cells (phellem) to the exterior and replace the epidermis. It also produces phelloderm to the interior. As cork cells mature their cell walls secrete a waxy substance called suberin.