Determining threshold values for barcoding fungi: lessons from Cortinarius (Basidiomycota), a highly diverse and widespread ectomycorrhizal genus

Sigisfredo Garnica, Max Emil Schön, Kessy Abarenkov, Kai Riess, Kare Liimatainen, Tuula Niskanen, Bálint Dima, Karl Soop, Tobias Guldberg Frøslev, Thomas Stjernegaard Jeppesen, Ursula Peintner, Regina Kuhnert-Finkernagel, Tor Erik Brandrud, Günter Saar, Bernhard Oertel, Joseph F. Ammirati