(3) There is a endothelium,it initiated from the megasporocyte stage and enoughly development in the stage of uninucleate embryo sac.
(3)有珠被绒毡层,珠被绒毡层起始于大孢子母细胞时期,单核胚囊阶段高度发育,受精后从合点端逐渐退化。
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