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 Monilielliomycetes 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 10 classes, 21 orders, and 38 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 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 Cystobasidiomycetes are a class of fungi in the subdivision Pucciniomycotina of the Basidiomycota. Most species are known from their yeast states; hyphal states, when present, produce auricularioid basidia and are frequently parasites of other fungi. The class contains five orders as well as two families and one genus (Queiroziella) of uncertain disposition. An additional order, Cyphobasidiales, has been proposed to accommodate several lichenicolous species, but its separation from the Erythrobasidiales has not been demonstrated.
The Microbotryomycetes are a class of fungi in the subdivision Pucciniomycotina of the Basidiomycota. The class currently contains eight orders, plus three additional, unassigned families, plus seven additional, unassigned genera. Many species are known only from their yeast states. Species with hyphal states typically produce auricularioid basidia and are often parasitic on other fungi or plants. Several species in the genera Rhodotorula and Sporobolomyces are opportunistic human pathogens.
The Kriegeriales are an order of fungi in the subdivision Pucciniomycotina. Most species are known only from their yeast states and can be found in a variety of habitats, ranging from arctic waters to tropical ferns. Hyphal states produce auricularioid basidia.
The Agaricostilbales are an order of fungi in the class Agaricostilbomycetes. The order consists of six families and 15 genera.
The Agaricostilbaceae are a family of fungi in the order Agaricostilbales. Basidiocarps (fruitbodies}, where known, are stalked and capitate and produce spores on basidia that are laterally septate. Most species are known only from their yeast states. The family contains two genera.
Colacogloea is a genus of fungi belonging to the class Microbotryomycetes. Most species in the genus are known only from their yeast states. Where known, basidiocarps have auricularioid basidia and occur as parasites on or in the fruit bodies of other fungi.
Phaeotremella is a genus of fungi in the family Phaeotremellaceae. All Phaeotremella species are parasites of other fungi and produce anamorphic yeast states. Basidiocarps, when produced, are gelatinous and are colloquially classed among the "jelly fungi". Fifteen or so species of Phaeotremella are currently recognized worldwide.
The Spiculogloeomycetes are a class of fungi in the subdivision Pucciniomycotina of the Basidiomycota. The class consists of a single order, the Spiculogloeales, together with an additional, unassigned genus, Meniscomyces. Many species are currently known only from their yeast states. Species in the genus Spiculogloea form hyphal states that produce auricularioid basidia and are parasitic on other fungi.
The Spiculogloeales are an order of fungi in the subdivision Pucciniomycotina of the Basidiomycota. The order is currently monotypic, consisting of a single family, the Spiculogloeaceae. Species in the genus Phyllozyma are currently known only from their yeast states. Species in the genus Spiculogloea form hyphal states that produce auricularioid basidia and are parasitic on other fungi.
The Cystobasidiaceae are a family of fungi in the order Cystobasidiales. The family currently comprises two genera, both of which contain fungal parasites with auricularioid basidia, some of which are known only from their yeast states.
The Cystobasidiales are an order of fungi in the class Cystobasidiomycetes. The order currently consists of a single family (Cystobasidiaceae) and two genera as yet unassigned to a family.
Occultifur is a genus of fungi in the family Cystobasidiaceae. Species are parasites of other fungi and, microscopically, have auricularioid basidia and basidiospores that germinate by yeast cells. Several species are currently only known from their yeast states. The genus is distributed worldwide.
The Kriegeriaceae are a family of fungi in the subdivision Pucciniomycotina. The family currently comprises four genera, one of which (Kriegeria) contains a plant pathogenic species with auricularioid basidia. The other genera contain species currently known only from their yeast states.
The Camptobasidiaceae are a family of fungi in the subdivision Pucciniomycotina. The family currently comprises two genera, one of which (Camptobasidium) contains an aquatic, hyphal species with auricularioid basidia. The other genus contains species currently known only from their yeast states.
Kriegeria is a genus of fungi in the subdivision Pucciniomycotina. The genus is currently monotypic, containing the single species Kriegeria eriophori. The species is a plant pathogen, parasitic on sedges, and produces auricularioid basidia and basidiospores that germinate to form a yeast state.
Slooffia is a genus of fungi in the subdivision Pucciniomycotina. Most species are known only from their yeast states. Known hyphal states produce auricularioid basidia, bearing basidiospores, and are parasitic on other fungi.
The Colacogloeaceae are a family of fungi in the class Microbotryomycetes. Members of the family produce yeast states; hyphal states, where known, give rise to auricularioid basidia and are parasitic on other fungi.
