Chaetocladium brefeldii
(Zygomycota, Zygomycetes, Mucorales, Chaetocladiaceae). Formation of galls as the typical infection structure in the interaction between Chaetocladium brefeldii and its numerous mucoralean hosts. The parasite is a fusion biotroph and forms a cytoplasmic continuum with the host. Parasitism is accompanied by gene transfer from the parasite to the hosts.