Ustilaginales - Information from Wikipedia on this order of fungi, members of which are serious plant pathogens and commonly called smuts. Exobasidium vaccinii - Several photographs of foliage affected by this species. Text in Polish. Ustilago tritici - Microscopic image. Ustilago maydis - Photographs of maize infected by this species. Ustilago maydis - Article by Tom Volk on this species which causes corn smut infecting the corn ears, but eaten as a delicacy in Mexico. Exobasidiaceae - Photographs of leaves affected by Exobasidium rostrupii and Exobasidium vaccinii.