Flag Smut - Urocystis agropyri can affect wheat and other grass species, the plants affected being severely stunted. Photographs and information on this fungus.
Loose Smut - Ustalago nuda is a fungus causing a seed borne disease which affects winter and spring barley. Information and a photograph.
Loose Smut - Ustilago nuda is the infective organism in this condition which affects wheat. Photographs and information.
Ustilaginales - Information from Wikipedia on this order of fungi, members of which are serious plant pathogens and commonly called smuts.
Ustilago maydis - Article by Tom Volk on this species which causes corn smut infecting the corn ears, but eaten as a delicacy in Mexico.
Ustilago maydis - Photographs of maize infected by this species.