During the foam stage of archegonium, the wall between the jacket cells and the central cells became fairly thick and the plasmodesmata present at the thinner area.

• 在颈卵器发育的泡沫化阶段，套细胞和中央细胞的接触壁不均匀加厚较为显著，在较薄的区域可见胞间连丝。