SEXUAL REPRODUCTION. 



305 



pericarp (fig. 354). In the blackberry the receptacle be- 

 comes fleshy, and each pistil forms a minute fruit like a 



FIG. 354. Fruit of the apple. A, halved longitudinally; B, halved transversely. _/", 

 pericarp, enclosing seeds ; g~, vascular bundles of the fleshy torus entering /, the 

 calyx leaves. One half natural size. After Focke. 



cherry, adherent to its neighbors and to the pulpy torus. The 

 raspberry is like it, except that the adherent mass of fruits 

 separates as a cap from a firm torus (fig. 355). 



413. Multiple fruits. --If the flowers form a crowded in- 

 florescence, either dry or fleshy fruits may be closely crowded 

 at maturity. Under these conditions fleshy fruits frequently 

 become adherent, and may thus constitute a multiple fruit 

 quite similar in form to the fruit formed by the aggregated 



355- 



FIG. 356. 



FIG. 355. Vertical section of a flower of raspberry (Ritbus itfteus), showing numerous 

 pistils which form the caplike fruit over the enlarged torus ; stamens, corolla, and 

 calyx all united at base. Magnified about 2 diam. After Kcrner. 



FIG. 356. A, pistillate flower cluster of white mulberry; />', multiple fruit from same. 

 Natural size. After Baillon. 



