山东飘拂草属叶下表皮微形态的研究

A study on the leaf abaxial epidermis of Fimbristylis Vahl from Shandong

利用光学显微镜观察了飘拂草属12个类群（包括变种和变型）的叶片下表皮微形态。飘拂草属叶下表皮微形态基本特征如下：即长细胞为长筒形、短筒形，少数为近方形或多边形，边缘深波状、浅波状至近平直；无短细胞存在；刺毛仅存在于个别种中；气孔器大多为1～2列，少数2～4列；副卫细胞为圆屋顶形至三角形、圆屋顶形，少数为平行形。根据脉间刺毛的有无，可以分为无刺毛类型和有刺毛类型。根据外部形态和叶下表皮微形态上的区别，矮扁鞘飘拂草，应恢复其种级（Fimbristylis kraussiana Hochst．et Steud．）。矮两歧飘拂草作为变种处理比较好，其新等级种名为：Fdichotoma（L．）Vahl var．depauperata（C．B．Clarke）F．Z．Li et L．N．Liu comb．＆ stat．nov．

The micro-morphology of leaf abaxial epidermis of 12 species （ including varieties and forma） of Fimbristylis from shandong were studied under light microscope. The results show that Fimbristylis is highly consistent in the micro-morphological characters, e.g. the shape of long-cells long-tubular or short-tubular, rarely sub-tetragonal or polygonal,the margin of cell wall sinuate, sinuolate to straight; short-cells between the vein absent; prickle hairs only exist in rare species; stomas between the vein mostly 2 columns, rarely 2 - 4 columns ;subsidary cells dome-shaped to triangular,dome-shaped, rarely parallel-sided. The leaf abaxial epidermis can be divided into two types： the prickle hairs exist and absent. According to morphology and micro-morphology of leaf abaxial epidermis, F. complanata （ Retz. ） Link var. kraussiana C. B. Clarke should be rehabilitated to species rank F. kraussiana Hochst et Steud. and F. dichotoma （ L. ） Vahl F. depauperat （ C. B. Clarke ） Ohwi is treated as F. dichotoma （L.） Vahl var. depauperata（C, B. Clarke）F. Z. Li et L. N. Liu comb. ＆ stat. nov.