Boletus dupainii    Boud. 



New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Boletales/Boletaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Boletales/Boletaceae/Boletoideae [ section:Luridi sub-section:Luridini]  

synonyms: Rubroboletus dupainii, Suillelus dupainii 

edibility : unknown edibility

potential confusions with  Boletus dupainii toxicity of Boletus dupainii genus Boletus  

The cap is bright, scarlet to tomato red, then stained with ochre, fleshy, hemispherical then convex to more or less flattened. The cap surface is viscid or slimy when damp, shiny as if laquered when dry. The cap margin is slightly overhanging.

The stem is thick, full, swollen towards its base. It is yellow coloured in the background, especially visible at the top, densely covered with bright red dots giving it an overall orange-red colour towards the base. It displays a network at the top..

The flesh is thick, whitish to pale yellow. It turns blue quickly but more or less strongly when in contact with air; its taste is mild; the odour is pleasant, fruity or musky according to various authors;

The tubes are thin, free, more or less long (5-10mm), yellow to olive-green, turning blue when sliced..

The pores are narrow, round, red-orange to carmine-red, more orange-yellow towards the margin, turning weakly blue when pressed. The spore print is light olive brown.

It grows in broad-leaved woods, on a rather calcareous soil, with beech, oak, chestnut trees.

The fruiting period takes place from July to November.
Dimensions: width of cap approximately 9 cm (between 6 and 12 cm)
  height of stem approximately 8 cm (between 5 and 10 cm)
  thickness of stem (at largest section) approximately 45 mm (between 30 and 60 mm)

Distinctive features : bright red cap, viscid in damp weather, shiny when dry; swollen stem, yellow at the top, displaying a network, but covered in red dots more and more densely towards the base; pale yellow flesh, turning blue when exposed to air: thin red-orange pores, turning blue when pressed; with broad-leaved trees on calcareous soils

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



page updated on 14/01/18