Fungi have diverse sex lives. They can have sex with a partner, with themselves or clone themselves. They are a great system to ask "Why is sex maintained despite the costs & risks compared to the advantages of cloning?" One hypothesis is it allows parasites to stay ahead of hosts' defenses. Physoderma fungi infect perennial plants and have limited dispersal. They may not need to keep up with their hosts' defenses. My study seeks to find out if Physoderma relies on partner sex or cloning.