Agaricus xanthodermus    Genev. 

common name(s) : Yellow Stainer, Yellow-staining Mushroom 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Agaricales/Agaricaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Agaricales/Agaricaceae/Agariceae  

synonyms: Psalliota xanthoderma, Agaricus xanthoderma 

edibility : poisonous

photo gallery of  Agaricus xanthodermus
photo gallery of  Agaricus xanthodermus potential confusions with  Agaricus xanthodermus toxicity of Agaricus xanthodermus genus Agaricus  

The cap is white, yellowing when touched. The cap surface is smooth, not viscid nor sticky.

The stem is bulbous, with a double ring.

The flesh is white, yellowing immediately when cut or touched; its taste is unpleasant, of phenol or ink; the odour is unpleasant, also of phenol or ink; its texture is fibrous.

The gills are white then bright pink then dark purple brown, free, crowded . The spore print is purple brown. This species is saprophytic. It grows on the ground, in parks, meadows, pastures, gardens, open woods, rich grassland.

The fruiting period takes place from April to November.
Dimensions: width of cap approximately 10 cm (between 2 and 20 cm)
  height of stem approximately 10 cm (between 3 and 15 cm)
  thickness of stem (at largest section) approximately 15 mm (between 10 and 30 mm)

Chemical tests : no reaction to Schaeffer's test; flesh tinted in orange when in contact with potash.

Distinctive features : spherical cap but flattened at its centre ('German grenade' shape when young) then flattened-expanded, staining yellow instantly when touched or bruised especially towards bulbous base; flesh turning yellow in stem base; odour and taste unpleasant (ink, phenol)

Agaricus xanthodermus is quite rare and scattered in the forest of Rambouillet, and is occasional, more generally speaking .
here should be the distribution map of Agaricus xanthodermus in the forest of Rambouillet
Above : distribution map of Agaricus xanthodermus in the forest of Rambouillet



page updated on 14/01/18