The researchers studied how a fungus called Mycena galericulata can reproduce both sexually and asexually. They collected fruiting bodies, did experiments, and analyzed DNA sequences to understand the relationship between the two forms. They found that the 4-spored type becomes more common towards the end of the growing season. Successful crosses only occurred between 4-spored strains. The DNA analysis showed that the 2-spored form is heterozygous, meaning it has different genetic material. This form is less common than the 4-spored one. The researchers ruled out some explanations for these findings, like secondary homothallism and diploidy.