44 



BOTANY OF THE LIVING PLANT 



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

 them lying isolated towards the 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 



3/n 



im 



FIG. 30. 



Transverse section of an internode of Zea. 

 Mais. pr= primary cortex. c=pericycle. 

 o>=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. w= median 

 bundle. (After De Bary.) S. 



