Distal ends of the cylindrical protuberances are joined to the distal ends of protuberances of other cells, and conspicuous pit fields occur in the walls where they join. The endocarp is the inner layer of the pericarp or the adaxial face of the hypothetical carpellary leaf. It is composed of an epidermis that lines the locules and a few adjoining layers of compactly arranged parenchyma cells. When the ovary is young, just before the petals open, the inner epidermis is a conspicuous meristematic layer with anticlinal divisions. Carpellary emergences and juice sacs appear as the petals open.
Carpellary emergences occur on sepal walls and on the endocarp.
Before the locules enlarge, the juice sac primordia, discussed earlier, are densely arranged. However with expansion of the locules to full size, the stalks of the juice sacs become scattered. The septa is the thin partitions between the locules. Each septum is composed of the locular membranes of adjacent fruit segments with intervening spongy mesocarp-like parenchyma. Segments are readily broken apart in C. reticulata , easily in C. sinensis , and with some force in C. paradisi , and with more force in C. grandis .