plural noun
Agar·i·ca·les | \ ə-ˌger-ə-ˈkā-(ˌ)lēz , -ˌga-rə- \

Definition of Agaricales 

: an extensive order of basidiomycetous fungi that includes the typical gilled mushrooms and a number of related forms all having the basidia produced in a distinct hymenial fruiting layer usually spread over the surface of a definite but transitory fruiting body which may be flat or be supinate, simply or compoundly club-shaped, or with the surface increased by pores, gills, or spines

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First Known Use of Agaricales

1899, in the meaning defined above

History and Etymology for Agaricales

New Latin, from Agaricus + -ales

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The first known use of Agaricales was in 1899

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