RHIZOMES AND ROOTS. 



245 



PLATE CVIL 



FIG. 117. Powdered Liquorice Root (x 240). ' 



a, Starch grains. 



ccr, Crystal cells, from cortex. 



f I, Scierenchymatous fibres, from wood and bast. 



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



pc, Cortical parenchyma, in transverse section. 



p'c', The same after treatment with potash. 



p"c", The same in longitudinal section. 



pd, Phelloderm. 



pi, Pitted cells of wood parenchyma. 



rm, r'm', Medullary rays in longitudinal and transverse section. 



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



ten, Crystal cells in rows. 



*!> *'!' Sieve tissue in longitudinal and transverse section 



v, v', Vessels in longitudinal and transverse section. 



