ustilago

From the genus name.

ustilago (plural ustilagos or ustilagoes)

1. Any of the genus Ustilago of smut fungi parasitic on grasses.
   • 1859, The Farmer's Magazine, page 524:

     It was generally believed, before the experiments made by M. Kuhn, but without any foundation, and upon simple conjecture, that the seminules or spores of the ustilagoes and uredoes of the cereals penetrate by the radicles of the plant in order to arrive, creeping by degrees, to the leaves and seeds of those vegetables.

• corn smut
• huitlacoche

From ustus.

• (Classical) IPA^(key): /us.tiˈlaː.ɡoː/, [ʊs.tɪˈɫaː.ɡoː]

ustilāgō f (genitive ustilāginis); third declension

1. A kind of wild thistle

Third declension.

• ustilago in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• ustilago in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette