The Allomyces macrogynus life cycle. The sporophyte generation is maintained asexually through the production of diploid zoospores. Meiosporangia that develop on the mature sporophyte produce meiospores, haploid uniflagellate spores that produce mature gametophytes capable of forming male and female gametangia. Gametes are released and undergo cell fusion (plasmogamy), followed by nuclear fusion (karyogamy), to form a biflagellate uninucleate zygote that develops into a sporophytic plant.