Name: means old root fungi.
Clades: Archaeorhizomycetaceae; Archaeorhizomycetales; Taphrinomycotina; Ascomycota; Fungi.
Genus: 500 species.
Region: Scandinavia, North America.
Habitat: on roots.
Ecology: host trees include hemlock, spruce, pine and heather, but other species colonise hardwoods generally; role is unclear, neither a pathogen nor an ectomycorrhizal symbiont.

TaxonomyArchaeorhizomycetes was referred to as Soil Clone Group 1 or SCGI after it was originally discovered tundra soils in 2003. The class was first described by a team led by Anna Rosling in 2011.

MycloogySpecies in the class are globally distributed, and grow in soil and around roots.
Fruit bodies: never observed.
Spores: never observed.