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sperm cell

One of the two male gametes formed in the pollen tube of gymnosperms after mitotic division of the *body cell. In some species, e.g. Cycas and Ginkgo, they are flagellate and swim from the pollen tube to the archegonia. Such antherozoids, in contrast to the nonmotile  *generative nuclei   of angiosperms, are associated with a large amount of cytoplasm and in Cycas reach a diameter of 300 μη. In other gymnosperms, e.g. the Gnetales and Coniferales, the sperm cells are not motile. The term sperm cell is sometimes applied to generative nuclei.


 
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