摘要
通过研究采自内蒙古准格尔旗早二叠世山西组的华夏齿叶Ｔｉｎｇｉａｃａｒｂｏｎｉｃａ的标本，首次揭示了该植物叶表皮构造。表皮为单面气孔式，表皮细胞呈不规则长方形。气孔器属多细胞类型中的无规则型，排列稀疏、近散生，气孔长椭圆形，保卫细胞周围具５～６个表皮细胞。依据表皮特征对该种植物的分类。
Two leafy specimens of Tingia carbonica were collected as impression from Shanxi formation of Permian, from Inner Mongolia, China. The epidermal structure of its leaves is reported in this paper. Under SEM, well preserved epidermal cells as well as some concaves on the surface of large leaves were clearly recognized. The epidermal cells are approximately rectangular in shape, about 100～150 μm long and 20～30 μm wide. They are arranged longitudinally parallel to veins. The concaves usually in rows are round or elliptical, about 0 65～0 35 mm long and 0 2～0 35 mm wide. Density of concaves is about 1 8/mm 2 and no stomata occur inside the concaves. In all probability, this is the upper epidermis. On the other side of the epidermis, anomocytic stomata are scattered irregularly, each with 5～6 epidermal cells around. The stomatal apertures are about 35 8 μm long, and 18 7 μm wide, which is organised parallel to the common epidermal cells. As far as shape and size is concerned, it is similar to that described on the upper epidermis. Density of the stomata is about 60/mm 2. In all Probability, this is the lower epidermis. The ecological preference and classification of Tingia are discussed according to these new characters of the epidermis and subordinate struture of the leaf.
出处
《植物分类学报》
CSCD
1998年第4期341-345,共5页
Acta Phytotaxonomica Sinica
基金
国家自然科学基金
中国科学院生物科学与技术研究特别支持费
古生物与古人类学科基础研究特别支持费资助
