Agaricomycetes Genera

The Agaricomycetes are a class of fungi in the division Basidiomycota. The taxon is roughly identical to that defined for the Homobasidiomycetes (alternatively called holobasidiomycetes) by Hibbett & Thorn, with the inclusion of Auriculariales and Sebacinales. It includes not only mushroom-forming fungi, but also most species placed in the deprecated taxa Gasteromycetes and Homobasidiomycetes. Within the subdivision Agaricomycotina, which already excludes the smut and rust fungi, the Agaricomycetes can be further defined by the exclusion of the classes Tremellomycetes and Dacrymycetes, which are generally considered to be jelly fungi. However, a few former "jelly fungi", such as ''Auricularia'', are classified in the Agaricomycetes. According to a 2008 estimate, Agaricomycetes include 17 orders, 100 families, 1147 genera, and about 21000 species. Modern molecular phylogenetic analyses have been since used to help define several new orders in the Agaricomycetes: Amylocorticiales, Jaapiales, Stereopsidales, and Lepidostromatales.

Classification

Although morphology of the mushroom or fruit body (basidiocarp) was the basis of early classification of the Agaricomycetes, this is no longer the case. As an example, the distinction between the ''Gasteromycetes'' (including puffballs) and ''Agaricomycetes'' (most other agaric mushrooms) is no longer recognized as a natural one—various puffball species have apparently evolved independently from agaricomycete fungi. However, most mushroom guide books still group the puffballs or gasteroid forms separate from other mushrooms because the older Friesian classification is still convenient for categorizing fruit body forms. Similarly, modern classifications divide the gasteroid order Lycoperdales between Agaricales and Phallales.

Features

All members of the class produce basidiocarps which range in size from tiny cups a few millimeters across to a giant polypore (''Phellinus ellipsoideus'') greater than several meters across and weigh up to . The group also includes what are arguably the largest and oldest individual organisms on earth: the mycelium of one individual ''Armillaria gallica'' has been estimated to extend over with a mass of and an age of 1,500 years.

Ecology

Nearly all species are terrestrial (a few are aquatic), occurring in a wide range of environments where most function as decayers, especially of wood. However, some species are pathogenic or parasitic, and yet others are symbiotic (i.e., mutualistic), these including the important ectomycorrhizal symbionts of forest trees. General discussions on the forms and life cycles of these fungi are developed in the article on mushrooms, in the treatments of the various orders (links in table at right), and in individual species accounts.

Evolution

A study of 5,284 species with a backbone phylogeny based on 104 genomesVarga T, Krizsán K, Földi C, Dima B, Sánchez-García M, Sánchez-Ramírez S, Szöllősi GJ, Szarkándi JG, Papp V, Albert L, Andreopoulos W, Angelini C, Antonín V, Barry KW, Bougher NL, Buchanan P, Buyck B, Bense V, Catcheside P, Chovatia M, Cooper J, Dämon W, Desjardin D, Finy P, Geml J, Haridas S, Hughes K, Justo A, Karasiński D, Kautmanova I, Kiss B, Kocsubé S6, Kotiranta H, LaButti KM, Lechner BE, Liimatainen K, Lipzen A, Lukács Z, Mihaltcheva S, Morgado LN, Niskanen T, Noordeloos ME, Ohm RA, Ortiz-Santana B, Ovrebo C, Rácz N, Riley R, Savchenko A, Shiryaev A, Soop K, Spirin V, Szebenyi C, Tomšovský M, Tulloss RE, Uehling J, Grigoriev IV, Vágvölgyi C, Papp T, Martin FM, Miettinen O, Hibbett DS, Nagy LG (2019) Megaphylogeny resolves global patterns of mushroom evolution. Nat Ecol Evol has suggested the following dates of evolution:

Agaricomycetidae ~ (–)

Cantharellales   (–)

Agaricales   (-)

Hymenochaetales (–)

Boletales (–)

Fossil record

The fruit bodies of Agaricomycetes are extremely rare in the fossil record, and the class does not yet pre-date the Early Cretaceous (146–100  Ma). The oldest Agaricomycetes fossil, dating from the lower Cretaceous (130–125 Ma) is '' Quatsinoporites''. It is a fragment of a poroid fruit body with features that suggest it could be a member of the family Hymenochaetaceae. Based on molecular clock analysis, the Agaricomycetes are estimated to be about 290 million years old.

Phylogeny

Modern molecular phylogenetics suggest the following relationships:

Genera ''incertae sedis''

There are many genera in the Agaricomycetes that have not been classified in any order or family. These include:

*'' Akenomyces''
*'' Aldridgea''
*'' Anixia''
*'' Arrasia''
*'' Arthrodochium''
*'' Arualis''
*'' Atraporiella''
*'' Cenangiomyces''
*'' Ceraceopsis''
*'' Corticomyces''
*'' Cruciger''
*'' Dendrosporomyces''
*'' Ellula''
*'' Fibulochlamys''
*'' Fibulocoela''
*'' Fibulotaeniella''
*'' Geotrichopsis''
*'' Gloeoradulum''
*'' Gloeosynnema''
*'' Glomerulomyces''
*'' Glutinoagger''
*'' Grandinia''
*'' Granulocystis''
*'' Hallenbergia''
*'' Hyphobasidiofera''
*'' Hypolyssus''
*'' Intextomyces''
*'' Korupella''
*'' Minostroscyta''
*'' Mylittopsis''
*''Odonticium''
*'' Pagidospora''
*'' Peniophorella''
*'' Phlyctibasidium''
*'' Pseudasterodon''
*'' Purpureocorticium'' S.H.Wu (2017)
*'' Pycnovellomyces''
*'' Resinicium''
*'' Riessia''
*'' Riessiella''
*'' Skvortzovia''
*'' Taiwanoporia''
*'' Timgrovea''
*'' Titaeella''
*'' Trechinothus''
*'' Tricladiomyces''
*'' Trimitiella''
*'' Tubulicrinopsis''
*'' Xanthoporus''
*'' Xenosoma''

References

External links

*

Tree of Life Agaricomycetes by David S. Hibbett


* ttp://www.mykoweb.com/articles/Homobasidiomycete_clades.html Evolution & Morphology in the Homobasidiomycetes
{{Taxonbar, from=Q27720

Basidiomycota classes
Lichen classes
Taxa described in 2001