伞菌纲（Agaricomycetes）不只包含了蕈类，也包含了被分类在较早期旧式的分类，腹菌纲和同担子菌亚纲中最多的物种。伞菌纲包含大约16,000已被描述的物种（占被描述的担子菌门中的53%）。本分类粗略的将同担子菌亚纲（由Hibbett & Thorn发表）归为同一纲，包含了木耳目（Auriculariales）和蜡壳耳目（Sebacinales）。在伞菌纲已经在包含墨粉菌和锈菌的伞菌亚门（Agaricomycotina）范围中，将可能更进一步认定银耳纲（Tremellomycetes）和 花耳纲（Dacrymycetes）列为同一等级，而这两个纲一般俗称为白木耳。然而，一些少数的前「白木耳」，像是木耳属（Auricularia），也会被归类在伞菌纲底下。

Agaricomycetes is a class of fungi. 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.