成熟的小孢子具有2个退化的原叶细胞(prothallial)、1个大的管细胞(tube cell)和1个较小的生殖细胞(generative cell)，外壁向两侧突出形成气囊。小孢子囊破裂后，花粉粒散出，随风飘扬。
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sieve-tube cell 筛管细胞
pollen tube cell 花粉管细胞
roll tube cell culture 转管细胞培养
sieve tube cell 筛管细胞
dry cell tube 干电池电子管
cell zinc tube extruder 电池锌筒挤压机
cell type tube 单元式电子管 ; 电池式电子管
Long tube absorption cell method [分化] 长吸收管法
There was no microbody in the generative cell but many microbodies were present in the tube cell cytoplasm.
生殖细胞内不具微体，而管细胞的细胞质有较多的微体。
More inclusions were present in the tube cell than in the generative cell.
管细胞比生殖细胞有更丰富的内含物。
DAPI staining demonstrated numerous cytoplasmic DNA in both generative cell and tube cell.
DAPI染色结果表明，生殖细胞及管细胞内均含丰富的细胞质dna。
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