Rhodocollybia butyracea    (Bull.:Fr.) Lennox 

common name(s) : Butter Cap, Buttery Tough-shank 

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

synonyms: Collybia butyracea, Collybia butyracea-butyracea, Rhodocollybia butyraceus 

edibility : discard

photo gallery of  Rhodocollybia butyracea
photo gallery of  Rhodocollybia butyracea potential confusions with  Rhodocollybia butyracea toxicity of Rhodocollybia butyracea genus Rhodocollybia  

The cap is with variable shades: dark reddish brown, paler towards margin, ivory when dry, convex then expanded, with a sharp central umbo; its margin is striate when moist. The cap surface is smooth, greasy to the touch.

The stem is hollow, swollen towards base, without ring.

The flesh is yellowish white, brown when damp, unchanging; its taste is mild; the odour is not distinctive or of rancid butter; its texture is fibrous.

The gills are white, adnate, crowded (nb of gills per 90° ~ 20 ). The spore print is white. This species is saprophytic. It grows on the ground, in broad-leaved and coniferous woods, on a rather acid soil, with beech, fir, spruce, larch, oak, birch.

The fruiting period takes place from July to December.
Dimensions: width of cap approximately 6 cm (between 2 and 9 cm)
  height of stem approximately 6 cm (between 2.5 and 10 cm)
  thickness of stem (at largest section) approximately 10 mm (between 5 and 25 mm)

Chemical tests : none.

Distinctive features : Variable colour, red-brown to ochre-buff cap, greasy to the touch, with an umbo; club-shaped stem with woolly mycelium base; white gills

Rhodocollybia butyracea is frequent and very widely present in the forest of Rambouillet, and is very frequent, more generally speaking .
here should be the distribution map of Rhodocollybia butyracea in the forest of Rambouillet
Above : distribution map of Rhodocollybia butyracea in the forest of Rambouillet



page updated on 14/01/18