There are remarkble differences between Equisetum L. and Hippochatete Milde in the type of stomas, at-tachments on the surface of stoma guard cells and the number of epithelial layers;

• 结果：木贼属和问荆属在气孔类型、气孔保卫细胞表面附属物及内皮层层数等方面有显著差异；