Apart from attacking nematodes nematophagous fungi also have the capacity to infect other fungi (act as myco- parasites). Nematode-trapping fungi such as A. oligospora attack their host fungi by coiling of the hyphae of the nematode-trapping fungi around the host hyphae, which results in disintegration of the host cell cytoplasm without penetration of the host. It was shown that nutrient trans- fer took place between the nematode-trapping fungus A. oligospora and its host R. solani using radioactive phos- phorous tracing (Olsson and Persson, 1994).