Information about the topics discussed at a symposium on One Fungus = One Name organized by the Centraalbureau voor Schimmelcultures (CBS)-Royal Netherlands Academy of Arts and Sciences (KNAW) Fungal Biodiversity Centre held on April 19-20, 2011 in Amsterdam, Netherlands is presented. The discussion focused on fungi, whether DNA sequencing makes dual nomenclature superfluous, and legacy of dual nomenclature.