Oliveorhiza P. Roberts (1998) Oliveonia is a genus of fungi in the order Auriculariales.

Species form thin, effused, corticioid basidiocarps (fruit bodies) with microscopically prominent cystidia and aseptate basidia producing basidiospores that give rise to secondary spores.

[1] All species are believed to be saprotrophic, most growing on dead wood.

[2] The genus was originally published by American mycologist L.S.

The genus was renamed Oliveonia by Dutch mycologist M.A.