The Mixiomycetes are a class of fungi in the Pucciniomycotina subdivision of the Basidiomycota.

[4] Only one species has been described to date, Mixia osmundae; this species was originally named Taphrina osmundae by Japanese mycologist Toji Nishida in 1911.

[5] It is characterized by having multinucleate hyphae, and by producing multiple spores on sporogenous cells.

[3] The genus name of Mixia is in honour of Arthur Jackson Mix (1888-1956), who was an American mycologist, who worked at the University of Kansas and used to study of the 'Taphrinales'.

[6] The genus was circumscribed by Charles Lawrence Kramer in Mycologia vol.50 (Issue 6) on page 924 in 1958.