pygidium

例句：

1. 1.The pygidium of the plant is a fascinating adaptation for survival in dry environments.
   这种植物的球茎是一种令人着迷的生存适应。
2. 2. The pygidium of the flower has a unique shape that attracts pollinators.
   花朵的球茎形状独特，吸引传粉昆虫。
3. 3.The pygidium of the fungus is essential for its growth and reproduction.
   真菌的球茎对它的生长发育和繁殖至关重要。