862 



A TEXTBOOK OF THEORETICAL BOTANY 



m 



Pericyclic fibres m -r .^M ^ 



^^^-< 



.^w:^^ 



.y-- 



Metaxylem 







■v 



*^HI«^^ 





v>-/. ^^f^'WM'"-^ ^^ 



\ 



I 



I 



Fig. 846. — Menispermum canade?ise. Dicotyledon. 

 Transverse section of a primary vascular bundle of 

 the stem. 



Ground tissue 



SZ Phloem | 



Metaxylem vessel 



^ Protoxylem cavity 



Sclerotic sheath 



Fig. 847. — Zea mais. Monocotyledon. Transverse 

 section of a vascular bundle of the stem. 



