Under the model, haploid nuclei of an A. spinulosporus isolate and of an isolate from an A. spinulosporus-like species underwent cellular fusion (plasmogamy) forming a heterokaryotic mycelium (i.e., a mycelium where cells contain two distinct nuclei). Next, nuclear fusion (karyogamy) resulted in the merging of the two genetically distinct nuclei and their genomes into a single one, giving rise to the allodiploid species A. latus which, is capable of undergoing asexual and sexual reproduction to produce asexual spores (conidia) or sexual spores (ascospores).