RHIZOMES AND ROOTS. 



221 



PLATE- XCV. 



VJD 



FIG. 105. Powdered Bryony Root (x 240). 



a, Starch. 



I, Bast. 



pc, Cortical parenchyma. 



pi, Parenchyma of wood. 



p.v., Walls of vessels. 



rm, Medullary rays. 



S,S', Cork, surface view and in section. 



sc, Sclerenchymatous cells. 



tr, Tracheids. 



v, vp, vs, Vessels. 



vg, Sieve tubes. 



vl, Laticiferous vessels. 



