RHIZOMES AND ROOTP. 



237 



PLATE XCIII. 



FIG. 103. Powdered Aconite Root (x 240). 



a, Starch grains. 



ca, c'a', Cambium in longitudinal and transverse section. 



e, Tegumentary tissue, surface view. 



I, I', Bast in longitudinal and transverse section. 



m, Debris of parenchyma of the pith. 



pc, Cortical parenchyma. 



pee, Outer part of the same. 



pi, Wood parenchyma. 



sc, Sclerenchymatous cells. 



tr, v, Pitted vessels, etc. 



