Equisetales

例句：

1. 1. The Equisetales are a fascinating group of organisms that form on rocks and soil.
   地衣是一种令人着迷的生物群落，它们在岩石和土壤上形成。
2. 2.The Equisetales play an important role in the ecosystem by absorbing carbon dioxide from the atmosphere.
   地衣在生态系统中起着重要作用，它们通过吸收大气中的二氧化碳。
3. 3.Researchers have discovered new species of Equisetales that can survive in extreme environments.
   研究人员发现了可以在极端环境中生存的新种地衣。