1) Fungus genus 2) Genus ustilago 
Ustilago is a genus of approximately 200 smut fungi parasitic on grasses. There is a large research community that works on Ustilago maydis including researchers at the University of Georgia, Philipps-Universität Marburg, University of British Columbia and others. Research with this organism has led to better understanding of the genetics underly...
A genus of basidiomycetous smut fungi comprising the loose smuts. ... (12 Dec 1998) ... 
Type: Term Pronunciation: ŭs′ti-lā′gō Definitions: 1. A genus of smuts (order Ustilaginales).
[n] - type genus of the Ustilaginaceae
genus Ustilago noun type genus of the Ustilaginaceae; genus comprising the loose smuts