Endocarp

Endocarp, the inner layer of the fruit, most correctly applied to such cases as the "stone" of the drupe, as in the cherry, plum, peach, etc., or the "shell "in the cocoa-nut, where there are three distinct layers all formed from the carpels or true gynoecial structures and not from the floral receptacle. The three layers are the epicarp, mesocarp, and endocarp, and are known collectively as the pericarp.