formation of infection structure haustorium mother cell formation Note that this term should not be used to annotate gene products of the host. It should only be used to annotate those gene products from the symbiont involved in this process. biological_process haustorium mother cell formation on or near host The process in which a symbiont cell is formed, separated from the tip of an infection hypha by a septum. The haustorium mother cell usually contains 2-4 fungal nuclei, and its function is to attach and penetrate the host. The host is defined as the larger of the organisms involved in a symbiotic interaction. GO:0075192