pericarp
A pericarp is the fruit casing or the fruit wreath of seed plants. The development of a fruit begins after fertilization of the seeds; The fruit is, therefore, the flower in the state of the maturity of the seed, in which regularly the flower organs, with the exception of the gynoeceum, perish. The gynoeceum wall is called a fruit-tree, also called pericarp, during the formation of the fruit. According to the characteristics of a pericarp in the ripe fruits, one distinguishes between opening, decaying and closing fruits. The inner epidermis of the pericarp is called the endocarp, the outer epidermis is called the exocarp; in between is the mesocarp, which is also called albedo in the citrus fruits because of its white color. These layers may be of the same type, for example, dry-skinned in the bellows-fruit, woody in the nut-fruit, or fleshy in the berry; Or they are different as in the case of the stone-fruit. Here, the wooded core surrounding the seed represents the endocarp, the pulp the mesocarp, and the skin overlying the exocarp.