The Ustilaginomycotina is a subdivision within the division Basidiomycota of the kingdom Fungi. It consists of the classes Ustilaginomycetes and Exobasidiomycetes, and in 2014 the subdivision was reclassified and the two additional classes Malasseziomycetes and Moniliellomycetes added. The name was first published by Doweld in 2001; Bauer and colleagues later published it in 2006 as an isonym. Ustilagomycotina and Agaricomycotina are considered to be sister groups, and they are in turn sister groups to the subdivision Pucciniomycotina.
Pucciniomycotina is a subdivision of fungus within the division Basidiomycota. The subdivision contains 9 classes, 20 orders, and 37 families. Over 8400 species of Pucciniomycotina have been described - more than 8% of all described fungi. The subdivision is considered a sister group to Ustilaginomycotina and Agaricomycotina, which may share the basal lineage of Basidiomycota, although this is uncertain due to low support for placement between the three groups. The group was known as Urediniomycetes until 2006, when it was elevated from a class to a subdivision and named after the largest order in the group, Pucciniales.
The Entylomatales are an order of smut fungi in the class Exobasidiomycetes. A monotypic order, it consists of a single family, the Entylomataceae. Both the family and order were circumscribed in 1997.
The Tilletiales are an order of smut fungi in the class Exobasidiomycetes. It is a monotypic order, consisting of a single family, the Tilletiaceae, which contains seven genera. The roughly 150 species in the Tilletiales all infect hosts of the grass family, except for species of Erratomyces, which occur on legumes.
Entorrhizomycetes is the sole class in the phylum Entorrhizomycota within the Fungi subkingdom Dikarya along with Basidiomycota and Ascomycota. It contains three genera and is a small group of teliosporic root parasites that form galls on plants in the Juncaceae (rush) and Cyperaceae (sedge) families. Prior to 2015 this phylum was placed under the subdivision Ustilaginomycotina. A 2015 study did a "comprehensive five-gene analyses" of Entorrhiza and concluded that the former class Entorrhizomycetes is possibly either a close sister group to the rest of Dikarya or Basidiomycota.
The Agaricostilbomycetes are a class of fungi in the subdivision Pucciniomycotina of the Basidiomycota. The class consists of a single order, six families, and 15 genera. Most species are known only from their yeast states. Where known, basidiocarps (fruitbodies) are typically small and stilboid (pin-shaped).
The Atractiellomycetes are class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. The class consists of a single order, the Atractiellales, which contains 3 families, 10 genera, and 58 species.
The Classiculomycetes are a class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. The class contains a single order, the Classiculales, which in turn contains the single family Classiculaceae. The family contains two monotypic genera.
The Cystobasidiomycetes are class of fungi in the subdivision Pucciniomycotina of the Basidiomycota. The class contains six orders: Buckleyzymales, Cyphobasidiales, Cystobasidiales, Erythrobasidiales, Naohideales, and Sakaguchiales.
The Microbotryomycetes are class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. Until recently, the class contained four orders: the Heterogastridiales, the Leucosporidiales, the Microbotryales, and the Sporidiobolales, which contained a total of 4 families, 25 genera, and 208 species. The order Kriegeriales, containing two families, Kriegeriaceae and Camptobasidiaceae, was defined in 2012.
The Mixiomycetes are a class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. The class contains a single order, the Mixiales, which in turn contains a single family, the Mixiaceae that circumscribes the monotypic genus Mixia. Only one species has been described to date, Mixia osmundae; this species was originally named Taphrina osmundae by Japanese mycologist Toji Nishida in 1911. It is characterized by having multinucleate hyphae, and by producing multiple spores on sporogenous cells.
The Pucciniomycetes are a class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. The class contains 5 orders, 21 families, 190 genera, and 8016 species. It includes several important plant pathogens causing forms of fungal rust.
The Ceratobasidiaceae are a family of fungi in the order Cantharellales. All species within the family have basidiocarps that are thin and effused. They have sometimes been included within the corticioid fungi or alternatively within the "heterobasidiomycetes". Species are saprotrophic, but some are also facultative plant pathogens or are associated with orchid mycorrhiza. Genera of economic importance include Ceratobasidium and Rhizoctonia, both of which contain plant pathogenic species causing diseases of commercial crops and turf grass.
Basidiopycnis is a fungal genus in the family Phleogenaceae. The genus is monotypic, containing the single species Basidiopycnis hyalina, found in Germany.
Proceropycnis is a genus of fungi in the Phleogenaceae family. The genus is monotypic, containing the single species Proceropycnis pinicola, known from Spain and east Asia.
The Heterogastridiales are an order of fungi in the Microbotryomycetes class of the Basidiomycota. The order contains a single family, the Heterogastridiaceae, which in turn contains five genera. Both the family and the order were circumscribed in 1990.
The Microbotryales are an order of fungi in the Microbotryomycetes class of the Basidiomycota. The order contains 2 families, 9 genera, and 114 species. The order was circumscribed in 1997.
The Helicobasidiales are an order of rust fungi in the class Pucciniomycetes. It contains the single family Helicobasidiaceae, which itself comprises three genera: Helicobasidium, Stypinella, and Tuberculina. Helicobasidiales was circumscribed in 2006.
The Urocystidales are an order of fungi within the class Ustilaginomycetes. The order contains 6 families and about 400 genera. They are a sister order to Ustilaginales.
The Platygloeales are an order of rust fungi in the class Pucciniomycetes. It contains two families, the Eocronartiaceae and also the Platygloeaceae.
