FLOWER-LAND. 



Fig. 154. Monocotyledonom 

 stem. 



Now I want you to try and understand the two 

 most common ways in which 

 these fibro-vascular bundles 

 are arranged within the stems. 

 In monocotyledons * they pass 

 up the stem, scattered about 

 here and there in the funda- 

 mental tissue (Fig. 154). But 

 in dicotyledons * the bundles 

 are arranged in it so as to form a ring. The 

 pictures will help you to understand this better, as 

 they show you the surfaces of two stems which have 



been cut across. It 

 is the ringed arrange- 

 ment which occurs in 

 most of our native 

 trees (Fig. 155). In 

 Fig. 152 you have 

 already noticed the 

 ring of fibro-vascular 

 bundles (f) surround- 

 ing and surrounded 

 by the fundamental 

 tissue. 



But notice the 

 picture, Fig. 1 52, a little more closely. The bundles you 

 see are made up of a darker and a lighter part. 



Fig. 155. Section of oak, several 

 years' growth. 



The 



* From the Greek " ntonos" one; or dis (duo), twice, double, and 

 cotyledons (cf. pp. 33 and 154). Monocotyledons, plants of which the 

 seeds have one seed-leaf ; dicotyledons, plants of which they have two. 



