RHIZOMES AND ROOTS. 



255 



PLATE CXIL 



FIG. 122. Powdered Rhatany Root x (240). 



a, Starch. 



fb, Wood fibres. 



fl, fl', Bast fibres in longitudinal and'trans verse section. 



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



pc, p'c', Bast parenchyma. 



p"c", The same accompanied by bast fibres. 



I'm, Medullary ray in radial section. 



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



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



