铁皮石斛营养器官的解剖学研究

结构植物学实验表明：铁皮石斛叶为等面叶，主脉处凹陷，两侧较厚；气孔只分布于下表皮，保卫细胞肾形，属四列型，叶脉较细，大小相间平行排列于叶肉中间，茎的基本组织由多角形或椭圆形的大型细胞和多数充满颗粒状物质的不规则形有4层细胞；外皮层、内皮层和中柱鞘均由一层厚壁细胞和薄壁的通道细胞排列组成；辐射维管束十原型，中央为大而明显的髓。

Anatomical study on the nutritive organs of Dendrobium candidum

The results of structural botanical experiment of nut ritive organs of Dendrobium candidum show:the leaf is of isobilateral;the st oma is of quadrilataral,only distributes in lower epidermis;there are alternatin g bigger vieins and smaller ones in the mesophyll;there are many polyhedral or e l lipsoidal cells and irregular cells full of particulate matter and a few of slim y cells containing needle-crystals in the ground tissue;collateral closed bund les scattered in it;the velamen of underground-root consists of 6～7 layers of cells,while the velamen of air-root consists of only 4 layers of cells;each o f the exodermis,endodermis and pericyle consists of a layer of sclerenchymal cel ls and parenchymal passage cells;radial vascular bundle of the root is of tenarc h.there is a big and evident pith in the middle part.