(a) A cross section of an immature anther with two microsporangia, each containing numerous microspores and a tapetum layer that provides the microspores with various nutrients and sporopollenin. (b) A mature, dehisced anther with pollen grains. The tapetum is now consumed. (c) A part of a pollen grain with a cross section of the pollen wall, showing the two layers of the exine (endexine and ectexine) and the largely pectocellulosic intine, which in contrast to the exine is derived from the microgametophyte
3.3c), at maturity.
3.3a) divides by meiosis into four haploid microspores.
3.3a), which provides the developing spores with nutrients, enzymes
and sporopollenin, conveyed through a liquid, the locular fluid.
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