To quote from a past post I wrote on this subject, it's "a plant fungus called Ustilago maydis and infects an ear of corn via the ovaries and turns the kernels into tumors or 'galls' and expands them to the point of becoming mini volcanoes of erupting black pus.".    From Wordnik.com.  [Deep End Dining] Reference

Both pure cultures of yeast (Saccharomyces carbajali, Candida utilis, etc.), and mixed cultures of yeast, fungi (Ustilago maydis), and bacteria (Corynebacterium glutamicum, Brevibacterium flavum) were used to produce the SCP biomass.    From Wordnik.com.  [Chapter 5] Reference

Materials Shipped: Ustilago nuda (Jensen) Rostrup.    From Wordnik.com.  [Think Progress » VIDEO: Rice Calls Idea That Iraq War Contributed To Regional Instability ‘Grotesque’] Reference

Germination of spores of Ustilago hordei and U. scitaminea in water extracts of amended soil.    From Wordnik.com.  [xml's Blinklist.com] Reference

Morphological and physiological studies on the resistance of sugar cane to Sclerospora sacchari and Ustilago scitaminea.    From Wordnik.com.  [xml's Blinklist.com] Reference

The week that last months Mycophagist article on Ustilago maydis was in the mail Narsai David devoted one of his short programs about it on radio station KCBS.    From Wordnik.com.  [Huitlacoche] Reference

Ustilago nuda Jensen Rostrup.    From Wordnik.com.  [Think Progress » 106.] Reference