TISSUES OF ANGIOSPERM8. 



445 



Fig. 323. Diagrams of dicotyledonous stems as seen in cross-section. R, the cor- 

 tical, 3/, the medullary portion of the fundamental system ; p, the phloe'm ; x, the 

 xylem ; b, 6, b, groups of bast fibres ; fc, the fascicular, io, the interfascicular canv 

 biiiui. After Sachs. 



