Open letter to the scientific community of mycologists: Provide voucher specimens

Reinhard Agerer^*, Joe Ammirati, Timothy J. Baroni, Paul Blanz, Régis Courtecuisse, Dennis E. Desjardin, Walter Gams, Nils Hallenberg, Roy Halling, David L. Hawksworth, Egon Horak, Richard P. Korf, Greg M. Mueller, Franz Oberwinkler, Gerhard Rambold, Richard C. Summerbell, Dagmar Triebel, Roy Watling