Leccinum aurantiacum    (Bull.) Gray 

common name(s) : Orange Bolete 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Boletales/Boletaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Boletales/Boletaceae  

synonyms: Leccinum albostipitatum, Leccinum rufum, Boletus aurantiacus, Boletus rufus, Krombholzia aurantiacum 

edibility : edible

photo gallery of  Leccinum aurantiacum
photo gallery of  Leccinum aurantiacum potential confusions with  Leccinum aurantiacum toxicity of Leccinum aurantiacum genus Leccinum  

The cap is of a uniform colour, red-orange to orange-brown (redder when very young), peelable, fleshy, firm, of globular shape at the beginning, then hemispherical, convex and finally flat-convex. The cap's diameter is hardly higher than the stem's length on young specimens.. The cap surface is dry, smooth to very finely downy. The cap margin is exceeding (up to 3mm), potentially covering pores, particularly in young specimens.

The stem is full, long and firm-tough, rough because of the small whitish scales covering it, these becoming orange like the cap, then brown with age. It is more or less equal in diameter or with a slightly swollen base. This base is often stained with blue-green, especially when pressed. The stem's surface background colour is white, under the coloured scales..

The flesh is thick, firm, getting soft when ageing in the cap, the stem being fibrous. It is white but becomes fleetingly pink when in contact with air, then uniformly purple grey, and finally blackish grey (the stem base becoming itself sometimes green-blue when exposed to air); its taste is faint or mild; the odour is weak to pleasant;

The tubes are practically free, or adnate through a groove, thin, long (10-40mm). They are white then yellowish-grey, turning pink when cut and exposed to air.

The pores are very small, round, white or cream then greyish, and eventually yellow grey, turning red when pressed. The spore print is pale brown.

It grows in grassy areas (clearings or wood edges) of damp deciduous forests; sometimes with conifers (mountains) or heather, or in parks, on a rather acid, but also calcareous soil, essentially with aspen, but also hornbeam, birch, alder, oak, beech, spruce or fir.

The fruiting period takes place from May to December.
Dimensions: width of cap approximately 13 cm (between 4 and 25 cm)
  height of stem approximately 14 cm (between 6 and 25 cm)
  thickness of stem (at largest section) approximately 30 mm (between 10 and 50 mm)
  spores : 12-19 x 4-5 microns, almost spindle-shaped

Chemical tests : no reaction of flesh to ammonia.

Distinctive features : orange cap; grey to white pores; tough stem, covered with small white (then dark rusty when mature) scales; flesh turning pink then black when exposed to air; primarily with aspen

Leccinum aurantiacum is infrequent and scattered in the forest of Rambouillet, and is occasional, more generally speaking .
here should be the distribution map of Leccinum aurantiacum in the forest of Rambouillet
Above : distribution map of Leccinum aurantiacum in the forest of Rambouillet

page updated on 14/01/18