The best replacement for spores is seeds.

The best alternatives to spores are rated as following:
★★★★★  seeds
★★★  gametes
★★  pollen
★  endospores
★  bacterial spores
★  vegetative cells
★  cysts
★  fungal spores
★  bacterial endospores
  ganoderma extract
  mold spores

Your alternative for spores is not listed? Suggest!
Speaking about spores, one probably shouldn't forget about malachite green.

Other search terms related to spores and their ratings are:
★★★★★ malachite green
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spores
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