Boletus edulis    Bull.:Fr. 

common name(s) : Penny Bun, Cep, Penny Bun Bolete 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Boletales/Boletaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Boletales/Boletaceae/Boletoideae [ section:Edules ]  

synonyms: Boletus edulis-edulis, Tubiporus edulis 

edibility : edible, good

photo gallery of  Boletus edulis
photo gallery of  Boletus edulis potential confusions with  Boletus edulis toxicity of Boletus edulis genus Boletus  

The cap is tawny-brown, chestnut-brown to grey-brown, fleshy, thick, sturdy, hemispherical then convex and more or less flattened. The cap surface is smooth (sometimes rough, but not velvety), soon dry, greasy to the touch or slightly viscid when damp. The cap margin is paler, often with a white line at the edge.

The stem is thick, full, initially egg-shaped then swollen, then more or less equal or stout. It is white, pale brown to hazelnut brown (paler than cap). It is covered with a white, thin network, mostly visible at the stem's apex, the mesh becoming coarser downwards.

The flesh is thick, firm, white, except under the cap surface, tinted with the cap's colour (vinaceous brown to reddish), unchanging when exposed to air; its taste is pleasant, mild to sweet, hazelnut like; the odour is pleasant;

The tubes are thin, easily removed from cap, long (15-35mm), whitish then yellow-greenish to green-brown, almost free, unchanging when exposed to air.

The pores are small, round, regular, white, then dull yellow, greenish yellow to green brown (concolorous to tubes), not changing colour when pressed. The spore print is olive brown.

It grows in ventilated and sunny places of broad-leaved or coniferous forests (edges, clearings, paths), solitary or in groups, on a rather acid, but also calcareous soil, with oak, beech, hornbeam, chestnut, birch, lime, spruce, pine, fir, hazelnut.

The fruiting period takes place from June to December.
Dimensions: width of cap approximately 17 cm (between 4 and 40 cm)
  height of stem approximately 13 cm (between 3 and 25 cm)
  thickness of stem (at largest section) approximately 45 mm (between 20 and 110 mm)
  spores : 12-18 x 4,5-6 microns, spindle-shaped

Chemical tests : no reaction to ammonia.

Distinctive features : smooth cap, not velvety but slightly greasy to the touch when moist, with a margin hemmed by a narrow white rim; clearly visible network on top of stem; vinaceous brown tinge just below cap surface; small and round pores; white flesh, unchanging when cut

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

page updated on 14/01/18