Rhodonia

Rhodonia
Scientific classification
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Polyporales
Family:	Fomitopsidaceae
Genus:	Rhodonia Niemelä (2005)
Type species
Rhodonia placenta (Fr.) Niemelä, K.H.Larss. & Schigel (2005)

Rhodonia is a fungal genus in the family Fomitopsidaceae. It is a monotypic genus, containing the single crust fungus Rhodonia placenta. A brown rot species, R. placenta is found in China, Europe, and North America, where it grows on decaying conifer wood.

The genus was circumscribed by Finnish mycologist Tuomo Niemelä in 2005 to contain the single species Rhodonia placenta. This crust fungus has undergone several changes in generic placement since it was originally described as a species of Polyporus by Elias Magnus Fries in 1861. Although often placed in Oligoporus or Postia, molecular analysis has revealed that this species is phylogenetically distant from those genera, appearing instead in a separate clade near Antrodia.

Rhodonia placenta has acquired an extensive synonymy in its taxonomic history. In addition to having been transferred to several polypore genera, it is considered to be the same species as Poria incarnata described by Christian Hendrik Persoon in 1794, as well as Petter Karsten's Bjerkandera roseomaculata (1891), and Physisporus albolilacinus (1892). Other taxonomic synonyms include William Alphonso Murrill's Poria monticola, Dow Baxter's Poria carnicolor (1941), and Lee Oras Overholts' Poria microspora (1943).

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