Abstract A new distribution map is provided for Ustilago segetum (Bull.) Roussel var. tritici (Pers.) Brun. 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, Armenia, Azerbaijan, Bhutan, Burma, China, Georgia, India, Bihar, Jammu & Kashmir, Madhya Pradesh, Rajasthan, Uttar Pradesh, Punjab, Himachal Pradesh, Maharashtra, New Delhi, Iran, Iraq, Israel, Japan, Kazakhstan, Kirgistan, Korea, Laos, Lebanon, Mongolia, Nepal, Oman, Pakistan, Russia, Central Asia, Siberia, Far East, Saudi Arabia, Syria, Tadjikstan, Taiwan, Thailand, Turkey, Turkmenistan, Uzbekistan, Yemen Republic, Australasia & Oceania, Australia, New South Wales, Queensland, South Australia, Tasmania, Victoria, Western Australia, Fiji, New Caledonia, New Zealand, Europe, Austria, Belgium, Bulgaria, Cyprus, Czechoslovakia, Denmark, Faroes, Estonia, Finland, France, Corsica, Germany, Greece, Crete, Hungary, Irish Republic, Italy, Latvia, Lithuania, Malta, Netherlands, Norway, Poland, Portugal, Romania, Russia, Spain, Sweden, Switzerland, UK, Britain & Northern Ireland, England, Wales, Scotland, Ukraine, Yugoslavia, North America, Canada, Mexico, USA, Central America & West Indies, Guatemala, Puerto Rico, South America, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru, Uruguay, Venezuela.