爬树蕨的解剖学研究

ANATOMICAL STUDY ON ARTHROPTERIS OBLITERATA

本文对爬树蕨（Ａｒｔｈｒｏｐｔｅｒｉｓｏｂｌｉｔｅｒａｔａ（Ｒ．Ｂｒ．）Ｊ．Ｓｍ）孢子体各主要器官进行了解剖学研究及对孢子进行了电子显微镜扫描观察，研究结果表明；茎的中柱具有两个新月形的维管束；幼茎的中部有髓．在较老的茎，髓部及中柱周围的细胞均特化为厚壁细胞．根属二原型中柱．木质分化方式是外始式；在对正后生木质部的两侧的皮层有几层特化为厚壁细胞。叶的叶肉细胞不分化出栅栏组织和海绵组织，为等面对。孢子囊具有纵向环带，孢子的形状、外壁的纹饰和裂缝情况均与以前的研究有所不同。

The main sporophytic organs of Arthropteris obliterato(R. Br.)J.Sm.were studied in anatomy, and the spores were observed by scanning. electron microscope.The reserch results showed that there are two innate vascular bundles in the stele of stem and pith in the middle of young stemlet.In the mature stem, the pith and the cells around the stele turned into sclerenchyma cells.The root belongs to diarch, the differentiation manner of xylem is exarch. Some cortex cells of each side directly towards metaxylem turned into sclerenchyma cells too.The mesophll cells of the leaf do not develop into palisade and spongy tissue,so it is isolateral leaf.The sporangium has longitudinal annulus. The shape of spores,ornamentation of exine and rimose character of spore are different from the results observed before.