Rhodonia

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***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.

## Taxonomy

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*.

### Synonymy

*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).

* *Polyporus placenta* Fr. (1861)
* *Physisporus placenta* (Fr.) P. Karst. (1882)
* *Poria placenta* (Fr.) Cooke (1886)
* *Leptoporus placenta* (Fr.) Pat. (1900)
* *Ceriporiopsis placenta* (Fr.) Domański (1963)
* *Tyromyces placenta* (Fr.) Ryvarden (1973)
* *Oligoporus placenta* (Fr.) Gilb. & Ryvarden (1985)
* *Postia placenta* (Fr.) M.J. Larsen & Lombard (1986)
* *Poria incarnata* Pers. (1794)
* *Boletus incarnatus* (Pers.) Pers. (1801)
* *Polyporus incarnatus* (Pers.) Fr. (1821)
* *Physisporus incarnatus* (Pers.) Gillet (1878)
* *Caloporus incarnatus* (Pers.) P.Karst. (1881)
* *Caloporia incarnata* (Pers.) P.Karst. (1898)
* *Ceriporia incarnata* (Pers.) Bondartsev (1953)
* *Bjerkandera roseomaculata* P.Karst. (1891)
* *Polyporus roseomaculatus* (P.Karst.) Sacc. (1895)
* *Ceriporiopsis placenta* f. *roseomaculata* (P.Karst.) Domański (1965)
* *Physisporus albolilacinus* P.Karst. (1892)
* *Poria albolilacina* (P.Karst.) Sacc. (1895)
* *Poria monticola* Murrill (1920)
* *Poria placenta* f. *monticola* (Murrill) Domański (1972)
* *Poria carnicolor* D.V.Baxter (1941)
* *Poria microspora* Overh. (1943)
* *Ceriporiopsis placenta* f. *microspora* Domański (1965)

## Description

The *Rhodonia* fruit body is spread out (effused) on its substrate, poroid, fairly thick, juicy and soft, with a pale rose or white colouring. It has a monomitic hyphal system (containing only generative hyphae), and the hyphae have clamp connections. These hyphae are initially thin-walled but become thick-walled in mature fruit bodies. The spores are cylindric.

## Sequencing

*Rhodonia placenta* had its sequenced genome published in 2009. It has an "unusual repertoire" of extracellular glycoside hydrolases—secreted enzymes that break down the complex sugars found in lignocellulose.

## References

1. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Zhishu 1993`
2. ↑ 2.0 2.1 2.2 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Niemelä 2005`
3. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Fungorum synonymy`
4. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Martinez 2009`

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