34 



PHARMACEUTICAL BOTANY 



3. Inner cortex of several layers of more or less isodiametric cells 

 (cells of nearly the same length, breadth and thickness) with thin 

 cellulose walls and containing stored starch surrounded by a proto- 



FIG. 12. Dryopteris filix-mai 



-Plant and section through pinnule and sorus. 

 (Sayre.) 



plasmic investment. These cells conduct sap by osmosis and 

 store food. Between the cells are" to be noted intercullular-air- 

 spaces, many of which contain internal glandular hairs. 



