绒毡层为 1层同型细胞 ,腺质性 ,幼期与其他药壁层相似 ,减数分裂开始后逐渐表现出自己独有的特点。小孢子母细胞纤维素壁生存到四分体时期 ,随着小孢子外壁出现而消失。四分体时期 ,小孢子发育出网状原覆盖层和柱状原基粒棒。成熟花粉属 2 -细胞型 ,含丰富淀粉和脂类物质 ,生殖细胞具有流线型结构 ,呈梭形或柳叶形。营养核与生殖细胞联系密切。 The tapetum is a layer of the same type of cells, glandular, young and other drug wall similar, meiosis began to gradually show its own unique characteristics. The microspore mother cell wall survived to the tetrad phase and disappeared with the appearance of microspore outer wall. During the tetrad period, the microspores developed the original reticular cover and the columnar primordium rods. Mature pollen is a 2 - cell type, rich in starch and lipid substances, germ cells with a streamlined structure, spindle or willow - shaped. Nutrient nuclear and germ cells are closely linked.