158 



PRACTICAL BOTANY 



The general scheme of arrangement of the apical 

 meristem is indicated in the diagram Fig. 11 : but in 

 comparing the sections with the diagram it must be 

 remembered that the figure represents an ideal Dico- 

 tyledonous type, and it must not be attempted to trace 

 a correspondence of minute detail of the sections with 



FIG. 11. Diagram illustrating the arrangement of meristem which may be found 

 at the apex of a root of a Dicotyledon, h h h, the root-cap, limited internally 

 by the line K K K, which represents the outer limiting wall of the dermatogen. 

 In the root-cap the letters A. A indicate anticlinals ; p p. the periclinal curves. 

 (After Sachs.) 



the diagram : thus in the diagram there is a sharp 

 limit K K, between the root-cap and the body of the 

 root, whereas in the Sunflower, as will be presently 

 shown, the root-cap and piliferous layer have a com- 

 mon origin. 



Examine with a high power : and observe that 



1. At some distance from the apex a definite 



