Agrocybe arvalis    (Fr.:Fr.) R. Heim & Romagn. 



New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Agaricales/Strophariaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Cortinariales/Bolbitiaceae  

synonyms: Agrocybe tuberosa, Naucoria temulenta ss.Ricken 
(unconfirmed synonyms: Naucoria arvalis)  

edibility : unknown edibility

potential confusions with Agrocybe arvalis toxicity of Agrocybe arvalis genus Agrocybe  

The cap is red-ochre to yellow-ochre, then cream when drying, convex then expanded, sometimes a bit umbonate; its margin is smooth, with white veil remnants. The cap surface is smooth, greasy to the touch when damp.

The stem is ochraceous cream, dusty, deeply rooting, emerging from a buried black sclerotium, without ring.

The flesh is creamy white to ochre, unchanging; its taste is mild to slightly bitter; the odour is mealy or faint and non specific; its texture is fibrous.

The gills are white then purple-grey, eventually tobacco brown, adnate to free or emarginate, crowded (nb of gills per 90° ~ 26 ). The spore print is dark brown. This species is saprophytic. It grows on wood (on woodchips) or on the ground, in parks, meadows, paths.

The fruiting period takes place from April to November.
Dimensions: width of cap approximately 2.5 cm (between 0.8 and 5 cm)
  height of stem approximately 8 cm (between 3 and 10 cm)
  thickness of stem (at largest section) approximately 5 mm (between 2 and 7 mm)

Distinctive features : Greasy but not sticky cap surface; deeply rooting ringless stem with white mycelium cords, arising from one or two brown-black sclerotia, a quarter to 1 inch thick; mealy to slightly bitter taste

Agrocybe arvalis is still unreported so far in the forest of Rambouillet, and is quite rare, more generally speaking .



page updated on 14/01/18