HORVAT, Ivo (October 7, 1897, Cazma - April 23, 1963, Zagreb), geobotanist and plant scientist. He graduated biology and geography from the Faculty of Philosophy in Zagreb where he received a PhD in 1920. He worked in the Botanical Institute, first as an assistant, then assistant professor and professor. From 1939 to 1940 he was head of the Botanical Institute and Gardens. From 1947 to his death Horvat was full professor of botany at the Faculty of Veterinary Medicine in Zagreb. As a visiting professor he held a series of lectures in Hamburg and Giessen as well as at the faculties in Zurich, Hamburg, Vienna, Krakow, Graz and elsewhere. He was engaged in the philogenetic research of ferns. He collected a valuable collection of moss for the herbarium of the Botanical Institute. His most important research being concerned with the vegetation of Croatia and other countries of southeastern Europe, he paid particular attention to the research and cartographic presentation of hilly and mountainous forest areas. Ivo Horvat achieved his greatest success in the field of research and mapping of the vegetation of the greater area of the National Park Risnjak. He made a number of the maps of plant communities of Croatia. The results of this work, for which he was awarded with the highest award, "Ruder Boskoviæ" Prize, were published in the papers published by the Yugoslav Academy of Arts and Sciences in Zagreb within its series Natural Sciences Research. He took part in a large number of scientific conferences both in the country and abroad and published more than 70 scientific, technical and popular-science papers. He worked as a member of the editorial board of the journal Vegetatio (Haag) and Excepta botanica, and a member of the International Commission for Methodics of Forestry Research of Vegetation.

Part of the vegetation map of the National park Risnjak by Ivo Horvat Part of the vegetation map of the South-Western Croatia by Ivo Horvat