... 外壁内表层 ectonexine 外壁内层 nexine 外壁内底层 endonexine ...
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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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