Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形，合点端功能大孢子发育成为蓼型胚囊。
There is only one layer of parietal cells at the stage of sporogenous cell, megaspore mother cell and tetrad.
造孢细胞，大孢子母细胞和四分体时期，周缘细胞仅1层。
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