Stamens with prominent anthers carrying pollen
The stamen is the male reproductive organ of a flower. It produces the pollen. The stamen has two parts: the anther, and the stalk.
The anther contains microsporangia. Each microsporangium contains pollen mother cells. These undergo meiosis, and produce pollen grains, which contain the male gametes (sperm).
The pollen grains are actually haploid male gametophytes.
The pollen is released by the opening of the anther. The pollen is carried by some agent (wind, or some animal) to the receptive surface of the carpel of the same or another flower. This process is known as pollination. After successful pollination, the pollen grain (immature microgametophyte) completes its development by growing a pollen tube and undergoing mitosis to produce two male gametes.