microspores

/M AY1 K R OW0 S P AO1 R Z/
noun
  1. 1

    The smaller of the two spores produced by plants; compare megaspore.

  2. 2

    One of the numerous tiny spore-like elements produced through the encystment and subdivision of many monads

Source: https://en.wiktionary.org/wiki/microspore, https://en.wiktionary.org/wiki/microspores