44 



BOTANY OF THE LIVING PLANT 



(Fig. 29). In other cases their regularity is Disturbed, the largest of 

 them lvia_^s^la^e^_jaj5onls_JJie_centre. But in sections of Palms, 



FIG. 29. 



Young shaft of Schoenus nigricans cut transversely : centrally is the pith, 

 surrounded by an irregular ring of vascular bundles. The dotted patches near the 

 periphery are mechanical tissue. ( x 35.) 



Maize, and Sugar-Cane such strands appear scattered throughout 

 the pithless stele (Fig. 30). This is a consequence of the fact that 



/m 



FIG. 30. 



Transverse section of an internode of Zea. 

 Mais. pr= primary cortex. pc*= pericycle. 

 cv=vascular bundles. gc=conjunctive paren- 

 chyma. ( x 2.) S. 



FIG. 31. 



Diagram showing the course of the vascular 

 bundles of the " Palm type " of Monoco- 

 tyledons. The numbers indicate the suc- 

 cession of the alternating leaves. m= median 

 bundle. (After De Bary.) S. 



