1. The haustrum structure of the two were similar and both were composed of parenchyma and spiral vessel.
   北桑寄生叶较薄，叶脉发达，无栅栏组织和海绵组织的分化。

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。