雌蕊受精后，由子房壁的组织分化、发育而成的多层不同的组织。成熟的果皮一般可分为外果皮、中果皮和内果皮三层
After the pistil is fertilized, it differentiates and develops into multiple different layers of tissue from the ovary wall. The mature fruit peel can generally be divided into three layers: the outer peel, the middle peel, and the inner peel.

未成熟果的果皮。
The pericarp of an immature fruit.

幼果的果皮。
The pericarp of a young fruit.