psephyte

例句：

1. 1. Psephytes are found in freshwater habitats such as lakes and rivers.
   藻类植物存在于淡水栖息地，如湖泊和河流。
2. 2. The psephytes were used for food and medicine by ancient civilizations.
   古代文明利用藻类植物作为食物和药物。
3. 3. In the ocean, psephytes play an important role in carbon cycling.
   在海洋中，藻类植物在碳循环中起着重要作用。