凤丫蕨属6种植物叶表皮特征的研究

The Leaf Epidermis Characteristics of Six Species of Coniogramme

利用光学显微镜和扫描电子显微镜对裸子蕨科(Hemionitidaceae)凤丫蕨属(Coniogramme)6种植物的叶表皮形态进行了观察和研究。结果表明:它们的叶片表面无附属物;具7种气孔器类型(极细胞型、腋下细胞型、不等细胞型、无规则四细胞型、聚合极细胞型、聚腋下细胞型和不规则型),在气孔器组成上具多型现象,气孔为下生型,不下陷,多沿叶的长轴方向排列;表皮细胞为不规则型,表皮细胞垂周壁呈浅波状或深波状。但6种凤丫蕨属植物在表皮细胞大小、气孔大小、气孔密度和气孔指数上存在一定的差异。上述研究结果为凤丫蕨属植物的系统分类及演化提供了证据。

The epidermal structures of the six species of Coniogramme in Hemionitidaceae were mvesugateu under light and scanning electron microscopes. The results indicate that： There are no trichome on both upper and lower epidermis of leaves in the six species; There are 7 types of stomatal apparatus（ Polocytictype, Axillocytictype, Aisocytictype, Anomotetracytictype, Copolocytictype, Coaxillocytictype and Anomocytictype）, the components of stomatal apparatus are polymorphic, all the stomatal apparatuses only occur in the lower epidermis, no caved in; Their epidermal cells are irregular, anticlinal walls undulate or sinuate. The six species of Coniogramme are different in the size of cell of leaf epidermis, the size of stomatal, Stomatao density and Stomatal index. These provide evidences for systematics of Coniogramme.