66 



Circinate that they are rolled up from the apex 

 downwards. 

 From the bases of the leaves arise tufts of roots and 

 from the lack of every t^reKth or fifteenth leaf arises 

 a hud. The stem is unbranched, any apparent 

 branching will be found to be a plant arising from a 

 bud. 



ANATOMY. 



1. The Stem. 



In transverse section the following structure is 

 presented . — 



(a) Epidermis. This consists of small cells, the 

 outer walls of which are strongly cuticularised. 



(b) Thin-walled Cortex which is parenchy- 

 matous, and serves as a storing tissue. 



(C) A BAND Of SCLERKKCHYMA, whoSO fuUCtioU is 



merely a mechanical one. This tissue exhibits 

 the thin places called " pits." 



(d) Yascular Bundles more or less regularly ar- 

 ranged in a ring. The ground tissue (paren- 

 chyma) separating the bundles receives the 

 name of Medullary Rays. 



(e) Pith. This is extensive. 



Bundles. 



i. Course. The Caidine bundles form a mesh- 

 work bearing a number of diamond-shaped 

 openings called Foliar Gaps. Each gap marks 

 the insertion of a leaf. From the margins of the 



