BARKS. 



13? 



PLATE L XXXV I. 



FIG. 96.- Powdered Condurango Bark (x 240). 



a, Small, simple starch grains. 



col, Collenchyma. 



cp, Prismatic and octohedral crystals from the phelloderm. 



cr, Rosette crystals. 



fl, Pericyclic fibres. 



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



pc, Cortical parenchyma. 



pd, p'd', Phelloderm, in transverse and tangential section. 



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



s, s', Cork, in tangential and transverse section. 



vg, Sieve-tubes, in longitudinal section. 



vl, vT, Laticiferous cells, in longitudinal and transverse section. 



