116 



COMPENDIUM OF GENERAL BOTANY. 



tissue generated from the interior, but the history of its growth and 

 development may differ very much in different cases. Behind the 

 root-cap, as this organ is called, lies the true root-lody, which is 

 especially adapted by the numerous root-hairs on the outer surface 



FIG. 63. Longitudinal section of the root-tip of Eriophorum vaginatum. 

 z, c, Root-cap ; e, epidermis; r, parenchyma; p, vascular system. (After Haberlandt.) 



to take up food-substances. The root-cap therefore covers the 

 cell-forming vegetative area, which could not withstand the friction 

 caused by contact with the sharp-angled particles of earth. 



The root-cap may 1. develop from a formative tissue designed 

 for that purpose ; examples: Triticum repens (or), Calla palustris 

 (/?.) In type (a) there is a sharp distinction between the meristem 

 of the root and that of the root-cap ; in type (0) there is no such 

 distinction. 



2. These two types among monocotyledons are represented by 

 two corresponding types among dicotyledons, but which differ es- 



