The secretion cavities (Fig. 7) are oval in form and the tissue bordering the cavity is reddish brown in color. The mesocarp cells around the secretion cavities are more elongated than the other mesocarp cells.
Endocarp. The endocarp cells are three layers in thickness. These cells are elongated transversely (Fig. 4).
Spermoderm. The cells of the spermoderm are indistinct, compressed, and dark brown in color (Fig. 5).
Endosperm. The endosperm cells (Fig. 6) make up the greater part of the fruit. The walls which are common to two cells are thick, non-beaded, and non-pitted, and the cavities of the cells are filled with aleurone grains.
Embryo. The embryo cells, which show only in certain sections, are similar to endosperm cells.
In anise, hops, sumac, and cumin fruits are characteristic hairs.
In star anise, sabal, allspice, cubeb, pepper, juniper, buckthorn, and phytolacca fruits are stone cells.
In cubeb, pepper, and cardamon are characteristic masses of aggregate starch.
In sabal, allspice, and juniper are characteristic secretion cells.
In all the umbelliferous fruits, with the exception of conium, are yellow to brown secretion cavities.