Some host species of hyperparasites do not necessarily have a fixed ecological strategy but rather exist on an ecological continuum during their life cycle, e.g., ranging from parasitism to saprotrophism. This can be illustrated by Armillaria spp., which are necrotrophs on various tree species. Once the host tree has died, Armillaria switches to a saprotrophic strategy, decaying the same tree substrate. Armillaria species themselves have been recorded as hosts for at least two agaricioid mycoparasites, namely Collybia cookei and Entoloma abortivum (see below). Nomenclatural issues may also arise when hyperparasites have multiple host species, some of which are parasites themselves whereas others may be saprotrophs. A prime example of this are species of Trichoderma , which infect both pathogenic and saprotrophic hosts (Jeffries and Young, 1994). In such cases use of the term “hyperparasite” maybe situational, depending on the ecological context of the host. Therefore, a “one-definition-fits-all” approach is unlikely to encapsulate the diversity of interactions observed in nature.