Reproduction Asexual spores are formed by the aerial mycelium of one organism. When these spores germinate, they become organisms that are genetically identical to the parent Sexual spores result from the fusion of nuclei from two opposite mating strains of the same species of fungus Organisms that grow from sexual spores will have genetic characteristics of both parental strainsReproduction Asexual spores are formed by the aerial mycelium of one organism. When these spores germinate, they become organisms that are genetically identical to the parent. Sexual spores result from the fusion of nuclei from two opposite mating strains of the same species of fungus. Organisms that grow from sexual spores will have genetic characteristics of both parental strains