Armillaria ostoyae    (Romagn.) Herink 

common name(s) : Dark Honey Fungus, Darkening Armillaria 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Agaricales/Physalacriaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Tricholomatales/Tricholomataceae/Clitocyboideae/Clitocybeae  

synonyms: Armillariella obscura, Armillariella ostoya, Armillaria obscura, Armillaria polymyces, Armillariella polymyces 

edibility : discard

photo gallery of Armillaria ostoyae
photo gallery of Armillaria ostoyae potential confusions with Armillaria ostoyae toxicity of Armillaria ostoyae genus Armillaria  

The cap is reddish brown, with darker scales, with a central umbo; its margin is inrolled, slightly striate, often wavy. The cap surface is scaly, not viscid nor sticky.

The stem is flexible, thin, yellowish at the base, with a ring.

The flesh is white, unchanging; its taste is irritant or soapy; the odour is faint; its texture is fibrous.

The gills are white then flesh pink, adnate, crowded . The spore print is white. This species is parasitic or saprophytic. It grows on wood (dead or not), in tufts, in coniferous (sometimes deciduous) woods.

The fruiting period takes place from July to December.
Dimensions: width of cap approximately 9 cm (between 2 and 20 cm)
  height of stem approximately 11 cm (between 6 and 15 cm)
  thickness of stem (at largest section) approximately 15 mm (between 5 and 30 mm)

Distinctive features : white ring and veil; dark brown scales in the middle of cap

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



page updated on 14/01/18