Fig. 37. Phloem portion of a leaf vascular bundle. Transverse section of the phloem portion of a vasculat bundle in a fully developed leaf. cc, companion cells; ens, cell of endodermal sheath; mp, region of metaphloem; ppa, phloem parenchyma cell; sc, fibers of sclernchyma cap at side of bundle; sit, sieve tubes. X340.