Abstract A new distribution map is provided for Ustilago nuda (Jens.) Rostr. Hosts: Barley ( Hordeum ), wheat ( Triticum ) oats ( Avena ). Information is given on the geographical distribution in AFRICA, Algeria, Angola, Egypt, Ethiopia, Kenya, Libya, Madagascar, Malawi, Mauritius, Morocco, Nigeria, South Africa, Sudan, Tanzania, Tunisia, Uganda, Zambia, Zimbabwe, ASIA, Afghanistan, Bangladesh, Burma, China, India, Iran, Iraq, Israel, Japan, Korea, Laos, Lebanon, Mongolia, Nepal, Oman, Pakistan, Saudi Arabia, Syria, Taiwan, Thailand, Turkey, USSR, Yemen Republic, AUSTRALASIA & OCEANIA, Australia, Fiji, New Caledonia, New Zealand, EUROPE, Austria, Belgium, Britain & Northern Ireland, Bulgaria, Cyprus, Czechoslovakia, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Malta, Netherlands, Norway, Poland, Portugal, Romania, Spain, Sweden, Switzerland, USSR, Yugoslavia, NORTH AMERICA, Canada, USA, CENTRAL AMERICA, Guatemala, Puerto Rico, SOUTH AMERICA, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru, Uruguay, Venezuela.