[5][6][1] Species in the Agaricales range from the familiar Agaricus bisporus (cultivated mushroom) and the deadly Amanita virosa (destroying angel) to the coral-like Clavaria zollingeri (violet coral) and bracket-like Fistulina hepatica (beefsteak fungus).

Bolbitiaceae Psathyrellaceae Hydnangiaceae Agaricaceae Nidulariaceae Cystodermateae Lyophyllaceae Entolomataceae Clitocybe candicans, C. subditopoda Tricholomataceae Dendrocollybia racemosa Neohygrophorus angelesianus Catathelasma clade Mycenaceae Omphalotaceae Marasmiaceae hydropoid clade Cyphellaceae Physalacriaceae Schizophyllaceae Lachnellaceae Hygrophoraceae Pterulaceae Typhulaceae Pleurotaceae Amanitaceae Pluteaceae Limnoperdaceae Atheliaceae Clavariaceae In his three volumes of Systema Mycologicum published between 1821 and 1832, Elias Fries put almost all of the fleshy, gill-forming mushrooms in the genus Agaricus.

[10] Molecular phylogenetics research has demonstrated that the euagarics clade is roughly equivalent to Singer's Agaricales sensu stricto.

[11][12][13] A large-scale study by Brandon Matheny and colleagues used nucleic acid sequences representing six gene regions from 238 species in 146 genera to explore the phylogenetic grouping within the Agaricales.

Agaricoid species were long thought to be solely terrestrial, until the 2005 discovery of Psathyrella aquatica, the only gilled mushroom known to fruit underwater.

[5] The three other species, Aureofungus yaniguaensis, Coprinites dominicana and Protomycena electra are known from single specimens found in the Dominican amber mines of Hispaniola.