Abstract: Micromorphological Characters of leaf epidermis of 12 species of Neottianthe Schltr.in China were examied by LW and SEM.It is found that the cells of both upper and lower epidermis are tetragonal,Pentagonal and hexagonal,anticlinal walls are stralght and arched;upper and lower epidermis are covered with cuticular membrance;stomatal apparatuses occur only on the lower surface and have just two guard cells without any accessory cells,there are "T"rod - like pieces at the polar region fo guard cells;outer stomatal ledge (or rim)are all unilayered .These characters are generally stable at genus level. Therefore the present anthors tend ot agree with Lang's (1997)view which 12 species combined Neottianthe.But it shows greatly diversity under LM and SEM that the size of epidermal cells, the inner mrgin of outer stomatal ledge and the cuticular ornamentaion.Besides,the anticlinal walls of eridermal cells in some spesies are significant pro-trusion.These dfferent micromorphological characters of leaf epidermis are usefull to identify some species in the genus Neottianthe .

Key words: Neottianthe, Leaf epidermis, Micromorphology

摘要： 利用光学显微镜和扫描电子显微镜观察了中国兜被兰属12种植物叶表皮的微形态特征，结果表明：该属植物成熟叶片的上下表皮均具角质层，其表面纹饰有直线形、浅波形。深波形和网状4种类型；有的种表皮细胞垂周壁明显凸起；气孔不具副卫细胞，仅分布在叶片下表面，气孔的外拱盖单层，表面光滑。这些特征在属级水平上较为一致，但也表现出种间差异，可以作为种间分类的辅助特征。

关键词: 兜被兰属, 叶表皮, 微形态