HISTOLOGY OF THE LEAF. 



85 



along the veins. The cells of the fundamental parenchyma 

 alter their form, lose their starch, and become filled with 

 bright-green, rounded bodies, called the chlorophyll-bodies, which 



FIG. 48. Epidermis from the under side of a leaflet, showing wavy cells; elongated (prosen- 

 chymatous) cells over the veins; and stomata with their guard-cells, st, stomata and 

 guard-cells ; r, veins covered by thick and prosenchymatous epidermal cells. Intermediate 

 stages between wavy and straight cells are also shown. (Surface view.) 



are composed of a protoplasmic basis colored by a substance 

 known as chlorophyll. The green parenchyma is often called the 

 mesophyU. 



A cross-section of a leaflet (p. 68) is shown in Fig. 45. The 



