ABSTRACT
The fruit of the genus Citrus is a special kind of berry (a hesperidium) composed of segments filled with spindle-shaped juice sacs. The whole is covered by white spongy tissue (albedo) and a coloured layer (flavedo) containing numerous oil glands (9). Although there is an outer waxy coating (cuticle), there are many natural openings (stomata). These various layers make up the peel or rind. The fruit having developed from a superior ovary, the calyx is to be found at the stem-end where, together with the floral disk, it forms the 'button' (6).
