Gasteroid fungi (Gastromycetes or Gasteromycetes) are an obsolete form taxon in the fungal kingdom because the polyphyletic origin of the groups assigned to it has since been demonstrated. The taxa concerned are now systematically assigned to the basidiomycetes. Gasteroid fungi are characterised by the fact that basidiospores are formed inside the fruiting body. The spore-bearing part, actually a gasteroid basidiocarp, is called a gasterothecium.

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