The nexine is thicker, but the structure of the bacula becomes hardly differentiation, it looks like sponge as a whole.
外壁内层较为厚实 ，但柱状结构分化不明显 ，整体呈海绵状 ；
The nexine is thicker, but the structure of the bacula becomes hardly differentiation, it looks like sponge as a whole.
外壁内层较为厚实 ，但柱状结构分化不明显 ，整体呈海绵状 ；
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