A family of fungi belonging to the order Agaricales WordNet 3.0

A family of fungi belonging to the order Agaricales, inclusive of any white-, yellow-, or pink-spored genera in the Agaricales not already classified as belonging to the Amanitaceae, Lepiotaceae, Hygrophoraceae, Pluteaceae, or Entolomataceae (Tricholomataceae) Open English WordNet

The Tricholomataceae are a large family of fungi within the order Agaricales. Wikipedia