At free microspore stage.Tapetal cells are papillar and have a high proportion of cytoplasm to vacuoles.Tectum of microspore shows a reticular pattern (arrow);

• 游离小孢子时期；绒毡层呈乳突状；细胞质与液泡的比例高.；小孢子外壁具有网状结构(箭号);