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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.
While parenchyma cells do occur within what is commonly termed the xylem the more identifiable cells, tracheids and vessel elements, tend to stain red with Safranin-O. Tracheids are the more primitive of the two cell types, occurring in the earliest vascular plants.Tracheids are long and tapered, with angled end-plates that connect cell to cell. Vessel elements are shorter, much wider, and lack end plates.hile parenchyma cells do occur within what is commonly termed the xylem the more identifiable cells, tracheids and vessel elements, tend to stain red with Safranin-O. Tracheids are the more primitive of the two cell types, occurring in the earliest vascular plants.