thallus of porphyra

例句：

1. 1. The thallus of the algae is covered in tiny hairs.
   这种藻类的叶状体上覆盖着微小的毛发。
2. 2.The alga's thallus is green and soft to the touch.
   这种藻类的叶状体是绿色的，摸起来柔软。
3. 3. The scientists studied the thallus of the algae to understand its ecological role.
   科学家们研究了藻类的叶状体，以了解其生态作用。