Boletus lupinus    Fr. 

common name(s) : Wolf Bolete 

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

synonyms: Rubroboletus lupinus 
(unconfirmed synonyms: Boletus splendidus-moseri)  

edibility : poisonous

potential confusions with  Boletus lupinus toxicity of Boletus lupinus genus Boletus  

The cap is blood-red, covered with a pink, short-lived down giving it a pale appearance, then the colour becomes lilac-pink to reddish-yellow, fleshy, thick, hemispherical then convex, finally more or less flattened. The cap surface is finely felty and dry, cracking sometimes over time, slightly sticky when damp.

The stem is thick, cylindrical or swollen towards its base. Its colour is yellow, with fine, more or less visible reddish dots. It has a limited network, essentially at the top of stem..

The flesh is thick and firm, golden yellow, turning blue more or less intensely when in contact with air; its taste is first mild, then more or less bitter; the odour is unpleasant: of rubber or puffball;

The tubes are thin and rather short (6-15mm), lemon yellow then greenish.

The pores are small, yellow then orange red to blood red, turning blue when pressed quickly but faintly. The spore print is olive brown.

It grows in broad-leaved forests and copses. This species privileges warm climates and comes usually solitary, on a rather calcareous soil, essentially with oak, beech.

The fruiting period takes place from July to November.
Dimensions: width of cap approximately 12 cm (between 5 and 20 cm)
  height of stem approximately 11 cm (between 7 and 15 cm)
  thickness of stem (at largest section) approximately 25 mm (between 0 and 50 mm)
  spores : 11-14 x 5-6 microns

Chemical tests : The flesh turns blue when in contact with iodine.

Distinctive features : cap covered with a short-lived pinkish pruinose topping; yellow stem, with a reduced network and fine reddish dots; red-orange pores, quickly turning blue when pressed

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

page updated on 14/01/18