82 



THE ANATOMY OF WOODY PLANTS 



three important categories of rays as occurring side by side in the 

 same stem. In the center of the circle representing diagram- 

 matically a dicotyledonous stem is figured a leaf gap and 



B' 



FIG. 63. Synoptical diagram representing the transverse and longitudinal 

 topography of the rays related to the leaves in species of Casuarina. Explanation 

 in the text. 



peripherally its subtending leaf. Between the two lies a corre- 

 sponding ray of the aggregate type. It is to be noted here that 

 there is a modification of the rate of growth of the annual rings 



