TISSUES OF ANGIOSPEUMS. 



445 



t'ig. 323.— Diagrams of dicotyledonous etems as Been in cioss-eectiou. iJ, the cor- 

 tical, M, tile meaullary portion of tiie fundamental system ; p, tlie ptiioSm ; a;, tlie 

 xyiem ; b, i, b, groups of bast fibres ; /«, the fascicular, ie, the interfascicular cam- 

 bium.— After Sachs. 



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

 tical parenchyma ; jp, «, parenchyma of the pith ; between r — rand JP — jP, sieve tis- 

 sue ; g, g, pitted vessels; s, «, and above, spiral vessels ; e — c, the cnmbium zone, x 

 SSO.— After De Bary 



