Tricholoma ustale    (Fr.:Fr.) P. Kumm. 

common name(s) : Burnt Knight, Bitter Tricholoma 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Agaricales/Tricholomataceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Tricholomatales/Tricholomataceae/Tricholomatoideae/Tricholomateae  

edibility : discard

photo gallery of  Tricholoma ustale
photo gallery of  Tricholoma ustale potential confusions with  Tricholoma ustale toxicity of Tricholoma ustale genus Tricholoma  

The cap is orange-red to chestnut, convex then expanded; its margin is paler, thin, smooth to wavy, sometimes slightly furrowed. The cap surface is smooth, viscid or sticky, with a non bittery slime.

The stem is paler than cap, whitish at the apex, reddish brown below, without any ring trace.

The flesh is white, turning slowly reddish brown when exposed to air; its taste is slightly bitter; the odour is faint, of meal or varnish; its texture is fibrous.

The gills are white then stained with reddish brown, the edge becoming dark with age, emarginate to narrowly adnate, rather distant . The spore print is white. This species is mycorrhizal. It grows on the ground, in broad-leaved woods, on a rather calcareous soil, most of the time with beech, and also with oak.

The fruiting period takes place from July to December.
Dimensions: width of cap approximately 6 cm (between 3 and 10 cm)
  height of stem approximately 7 cm (between 3 and 12 cm)
  thickness of stem (at largest section) approximately 14 mm (between 10 and 23 mm)

Distinctive features : red-brown to chestnut-brown cap, viscid to sticky, with its surface with a mild taste; stem with ring trace; white gills, with their edge blackening only very late or none at all; white stem at the top, red-brown towards base; flesh with bitter taste; with broad-leaved trees (favouring beech)

Tricholoma ustale is quite rare and localised in the forest of Rambouillet, and is occasional, more generally speaking .
here should be the distribution map of Tricholoma ustale in the forest of Rambouillet
Above : distribution map of Tricholoma ustale in the forest of Rambouillet

page updated on 14/01/18