Tricholoma equestre or Tricholoma flavovirens, also known as man on horseback or yellow knight is a formerly widely eaten but hazardous fungus of the Tricholoma genus that forms ectomycorrhiza with pine trees. Known as Grünling in German, gąska zielonka in Polish, and canari in French, it has been treasured as an edible mushroom worldwide and is especially abundant in France. Although it is regarded as quite tasty, cases of poisoning from eating T. equestre have been reported. Research has revealed it to have poisonous properties.