Exobasidiomycetes Ustilaginomycetes Malasseziomycetes Monilielliomycetes Peribolosporomycetes The Ustilaginomycotina is a subdivision within the division Basidiomycota of the kingdom Fungi.

Ustilaginomycotina has some of the best known and studied genera of plant parasites like Ustilago and Tilletia and it is also of great economic importance.

[1][10] 5S rRNA In 1985 Gottschalk and Blanz did a study about the 5s ribosomal RNA and distinguished two types of structures in the Basidiomycota.

[1][4] With the use of electron microscopy, Bauer et al. 1997 found two separates lines of the smut fungi, namely the Microbotryales (which is now moved to Pucciniomycotina) and the Ustilaginomycetes.

With the use of both morphological characters and molecular data, the subdivision is now reclassified and many of the species has been renamed by the 'One Fungus = One Name' principle.

'[2] By looking at ultrastructural morphological structures like host-parasite interactions, the septal pore apparatus[1][10] and molecular sequence analysis a new classification was proposed.

[14][15] Ustilaginomycotina have an array of plant pathogens, and some are parasitizing on economically important species like wheat, barley and corn.

The saprobic phase is initiated by the production of haploid yeasts, which fuses with another spore and produce the n+n hyphae which will infect the host.

The infection happens with the production of a structure called an appressorium, which is generated by a specialized cell used to penetrate the host cuticle.

Inside the host, the fungi will produce hyphae and another specialized structure called haustoria.

Almost all of the Ustilaginomycotina will then sporulate inside the host, and this happens with the spore becoming thick-walled and will separate, now called a teliospore.