''Rhodonia'' is a genus of fungal

crust fungi The corticioid fungi are a group of fungi in the Basidiomycota typically having effused, smooth basidiocarps (fruit bodies) that are formed on the undersides of dead tree trunks or branches. They are sometimes colloquially called crust fungi or pa ...

in the family

Fomitopsidaceae The Fomitopsidaceae are a family (biology), family of fungi in the order Polyporales. Most species are parasitic on woody plants, and tend to cause Wood-decay fungus#Brown rot, brown rots. The name comes from ''Fomitopsis'' (meaning "looking like ...

. The species in the genus are species of brown rot, found in China, Europe, and North America, where it grows on decaying

conifer Conifers () are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a sin ...

wood.

Taxonomy

The genus was

circumscribed In geometry, a circumscribed circle for a set of points is a circle passing through each of them. Such a circle is said to ''circumscribe'' the points or a polygon formed from them; such a polygon is said to be ''inscribed'' in the circle. * Circum ...

by the Finnish mycologist Tuomo Niemelä in 2005 to contain the species '' Rhodonia placenta''.

Species

The following species are recognised in the genus ''Rhodonia'': * '' Rhodonia obliqua'' (Y.L.Wei & W.M.Qin) B.K.Cui, L.L.Shen & Y.C.Dai (2018) * '' Rhodonia placenta'' (Fr.) Niemelä, K.H. Larss. & Schigel (2005) * '' Rhodonia rancida'' (Bres.) B.K.Cui, L.L.Shen & Y.C.Dai (2018) * '' Rhodonia subplacenta'' (B.K.Cui) B.K.Cui, L.L.Shen & Y.C.Dai (2018) * '' Rhodonia tianshanensis'' Yuan Yuan & L.L.Shen (2017)

Description

The

fruiting bodies The sporocarp (also known as fruiting body, fruit body or fruitbody) of fungi is a multicellular structure on which spore-producing structures, such as basidia or asci, are borne. The fruitbody is part of the sexual phase of a fungal life cyc ...

of species of the genus ''Rhodonia'' are spread out (effused) on its

substrate Substrate may refer to: Physical layers *Substrate (biology), the natural environment in which an organism lives, or the surface or medium on which an organism grows or is attached ** Substrate (aquatic environment), the earthy material that exi ...

, poroid, fairly thick, juicy and soft, with a pale rose or white colouring. It has a monomitic

hypha A hypha (; ) is a long, branching, filamentous structure of a fungus, oomycete, or actinobacterium. In most fungi, hyphae are the main mode of vegetative growth, and are collectively called a mycelium. Structure A hypha consists of one o ...

l system (containing only generative hyphae), and the hyphae have

clamp connection A clamp connection is a hook-like structure formed by growing hyphal cells of certain fungi. It is a characteristic feature of basidiomycete fungi. It is created to ensure that each cell, or segment of hypha separated by septa (cross walls), rece ...

s. These hyphae are initially thin-walled but become thick-walled in mature fruit bodies. The

spores In biology, a spore is a unit of sexual (in fungi) or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plant ...

are cylindric.

References

{{Taxonbar, from=Q10653291 Fomitopsidaceae Basidiomycota families Taxa described in 2005