pycnothyrium

例句：

1. 1.The pycnothyrium is a rare species of seaweed that grows on the ocean floor.
   海葵是一种罕见的海洋藻类，生长在海底。
2. 2.The pycnothyrium is known for its ability to produce toxic chemicals when damaged.
   海葵因其在受损时能产生有毒化学物质而闻名。
3. 3. The pycnothyrium was used as a food source by indigenous peoples for thousands of years.
   海葵被土著人民用作数千年来的食物来源。