TISSUES OF ANGIOSPEhMS. 



445 



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

 tical, M, the medullary portion of the fundamental system ; p, the phloem ; x, the 

 xylem ; b, b, b, groups of bast fibres ; fc, the fascicular, ic, the interfascicular cam- 

 bium. After Sachs. 



Fig. 324. Cross-section through a young internode of Sambucus nigra. P, P, cor- 

 tical parenchyma ; p, p, parenchyma of tin- pith : between r randP P, sieve tis- 

 iiid above, spiral vessels ; < - <, the cumbiuni zone, x 



sue ; ff. Qi pitted vessels ; *, 

 0.- After De Bary 



