Section outline
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Armillaria is a root-infecting basidiomycete genus comprising a large number of species with a worldwide distribution. Currently, more than 40 Armillaria/Desarmillaria species have been officially described and recognized, but studies of species richness based on DNA sequences in public databases suggest that 50–60 Armillaria species may occur. In many cases, species of Armillaria are distinct between the Northern and Southern Hemisphere.