关键词: 银杏, 表皮, 蜡质层, 气孔

Abstract: By using LM and SEM, the epidermis of macerated and unmacerated leaves, and the epidermis of young and mature leaves were investigated in Ginkgo biloba.The basic epidermal characters:amphistomatic, but most of stomata are in the lower epidermis.The number and distribution of the stomata in the upper epidermis are different individually.The stomatal apparatus is haplocheilic and monocytic:the sunk guard cells are usually surrounded by 5~6 subsidiary cells with thicken and papillate periclinal walls.Double stomata present occasionally.The upper epidermis is thicker than the lower.The morphology of the epidermis cells between vein zone are obviously distinguishable from those in vein zone.Epicuticular wax:The leaf wax forms wax crystalloids on the leaf surfaces in form of small round tubules as seen in the SEM with higher magnification.The majority projects of hollow tubules are away from the epidermis.And the branched wax tubules also had been found.Stomatal development:the development of stomata is typical perigenous that guard cell and subsidiary cell come from different mother cell, not meso-perigenous.

Key words: Ginkgo biloba, epidermis, epicuticular wax, stomat