Plate XV. 



FIG. 28. Transection of the stem of a Monocot, Smtlax htepida. A, epidermis; 



B, small closed fibro-vascular bundle, formed in the ring of meristematic tissue, 

 where, by the development of new bundles, the stem is enabled to increase in si/.e; 



C, mature vascular bundle; D, cortical parenchyma; E, phloem; F, xylem. (x80). 



