Tricholoma pessundatum is a mushroom of the agaric genus Tricholoma.
First described as Agaricus pessundatus by Elias Magnus Fries in 1821, it was transferred to the genus Tricholoma by Lucien Quélet in 1872.
The orangish cap is up to across, with a lighter margin, and is viscid when wet. The gills are white but develop stains and vary in attachment. The stem is up to long. The spore print is white.
It has a sour meal odor.
A very similar species to the European mushroom is Tricholoma muricatum, which differs only in microscopic details.
It contains toxins which can cause severe gastrointestinal upset.