七指蕨科和瓶尔小草科植物的叶表皮特征

在光学显微镜和扫描电子显微镜下，对七指蕨科和瓶尔小草科３个属３种代表植物的叶表皮内外面进行了观察。它们的表皮细胞形状较规则，垂周壁平直或略有弯曲，气孔器长轴与叶片长轴平行或近平行，保卫细胞下陷；但三属叶表皮在表皮细胞形状，

THE LEAF EPIDERMIS OF HELMINTHOSTACHYACEAE AND OPHIOGLOSSACEAE

The outer and inner surfaces of leaf epidermis of three genera ( Heminthostachys, Ophioderma, Ophioglossum) in Heminthostachyaceae and Ophioglossaceae were investigated under light and scanning electron microscopes. Their epidermal cells are regular with straight or slightly curved anticlinal walls. The longitudinal axes of stomatal apparatus generally parallel with the long axis of the lamina. Guard cells somewhat sunken. The epidermal features of the three genera are different in the outline of epidermal cells, the degree of curved anticlinal wall of epidermal cells, the distribution and types of stomatal apparatus. These differences contribute evidences for systematics of Ophioglossales.