Bud 



Cortical 

 Medullary 



SKio 

 Cortical 



- - -Medullary (outer) 



- - -W 



FIG. 105. Illustration showing the internal structure of a potato tuber, and relation 

 to structure of a stem. Note that the inner medullary, corresponding to the pith in a stem, 

 is connected with the eyes of the tuber. The outer portion is richest in starch and the inner 

 portion poorest in starch. 



