194 



GROWTH AND WORK OF PLANTS 



the drupelets of the blackberry and dewberry adhere to the recep- 

 tacle and the latter separates from the stem. 



Fig. 156. 

 Aggregate fruit of raspberry; at left, the drupelets removed, showing the persistent receptacle. 



325. The berry. In the true berry both exocarp (including 

 mesocarp) and endocarp are fleshy or juicy. Good examples are 

 found in cranberries, huckle- 

 berries, currants, snowberries, 

 tomatoes, etc. The calyx and 

 wall of the pistil are adnate, 

 and in fruit become fleshy so 

 that the seeds are imbedded in 

 the pulpy juice. The seeds 

 themselves are more or less 

 stony. In the case of berries, 

 as well as in strawberries, rasp- 



berry. 



berries, and blackberries, the 



fruits are eagerly sought by birds and other animals for food. 

 The seeds being hard are not digested, but are passed with the 

 other animal excrement and thus gain dispersal. 



