【摘要】 研究了石山苏铁与锈毛苏铁叶的羽片横切面结构。结果表明,石山苏铁叶表面具厚的角质层,表皮细胞壁厚,排成整齐的一列;下皮层厚壁细胞仅分布于中脉隆起区和叶缘;叶肉由栅栏组织和海绵组织构成,栅栏组织为排列整齐的柱状细胞组成,位于近轴面的表皮层下方,并延伸至中脉区;海绵组织的细胞分布于副转输组织两侧,含晶细胞少;韧皮部在远轴面,排成弧形;木质部在近轴面,管胞分散。锈毛苏铁的羽片横切面结构在叶缘的形态、叶脉区隆起形态、韧皮部形态、分泌道有无及下皮层厚壁细胞的特点等方面与石山苏铁存在较明显的差异。本文支持把两者作为独立种的观点。更多还原

【Abstract】 In orderto makesurewhetherCycas miquelii andC.ferruginea areof thesamespecies, the authorshaveobservedanatomicallythetwospecies.Theresultsshowthattheleafsurfaceof C.miquelii coveredwiththickcuticle.Wallof epidermalcellis thickand arrangedregularlyin one layer.Hypodermalsclerenchymacellsexistintheraisedmidribregionand pinnamargins.Mesophyllconsists of palisadeandspongytissues.Palisadetissueis composedof cylindricalcellsbeingregularlyarranged,beneathadaxialhypodermisandpresentabovethemidrib.Thecellsof spongytissuearedistributedat thetwosidesof theaccessorytransfusiontissue.Crystalcellsarefew.Thephloemlocateson abaxialside andisarrangedinarchshape,whilethexylemon adaxialside.Tracheidsarescattered.Cycas miquelii is obviouslydifferentfromC.ferruginea instructureintransversesection,suchastheshapesofpinnamargin,raisedmidribregionandhypodermalsclerenchymacells.Basedon suchdifferencesbetweenC.miquelii andC.ferruginea,theauthorsconsiderthattheyareseparatespecies.更多还原