六种苏铁属植物的羽片比较解剖学研究

Studies on Comparative Anatomy of the Pinnae of Six Species of Cycas

研究了锈毛苏铁 (Cycasferruginea)、石山苏铁 (C .miquelii)、四川苏铁 (C .szechuanensis)、海南苏铁(C .hainanensis)、仙湖苏铁 (C .fairylakea)和贵州苏铁 (C .guizhouensis)等六种苏铁属植物羽片的比较解剖学 ,结果显示锈毛苏铁与石山苏铁在下皮层厚壁细胞、海绵组织中含晶细胞、中脉隆起、叶缘形态、韧皮部形态及分泌道的有无等特征上具有较明显的差异 ;四川苏铁与海南苏铁和仙湖苏铁非常相近 ;海南苏铁与仙湖苏铁基本一致 ;贵州苏铁在中脉隆起、叶缘形态、韧皮部形态等方面与四川苏铁、海南苏铁及仙湖苏铁三者有差异。支持将锈毛苏铁、石山苏铁独立为种的观点 ,并认为海南苏铁与仙湖苏铁不能区分。四川苏铁与海南苏铁和仙湖苏铁具有较近的种系关系 。

The comparative anatomy of the pinnae of six species,namely, Cycas ferruginea, C. miquelii, C. szechuanensis,C. hainanensis,C. fairylakea and C. guizhouensis in China, was studied. The results indicate that C. ferruginea differs obviously from C.miquelii in hypodermal sclerenchymatous cells, crystal cells among the spongy cells, raised midrib region,the morphology of leaf margin and phloem, and absence or presence of secretory canal. C. szechuanensis is very similar to C. hainanensis and C.fairylakea , and the latter two are more close to each other. C.guizhouensis differs from C. szechuanensis,C. hainanensis and C. fairylakea in raised midrib region, the morphology of leaf margin and phloem. The view that C. ferruginea and C.miquelii are independent species is supported in this paper. The differences between C. hainanensis and C. fairylakea scarcely exist. C. szechuanensis is closed to C. hainanensis and C. fairylakea. C. guizhouensis is distant from the other species.