Boletus radicans    Pers.:Fr. 

common name(s) : Rooting Bolete, Whitish Bolete 

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

synonyms: Caloboletus radicans, Boletus amarus, Boletus albidus, Boletus albidus-radicans, Tubiporus albidus, Boletus radicans-pachypus 

edibility : discard

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

The cap is whitish to buff-cream, becoming grey then brownish, with more or less visible greenish to pinkish shades, fleshy, thick, convex then expanded, possibly irregularly depressed. The cap surface is finely felty and dry, cracking sometimes over time, slightly sticky when damp. The cap margin is fleshy, membranous at the tip, inrolled.

The stem is massive, stout and turnip-shaped, rooting. It is bright yellow close to the apex, whitish to orange-red towards the bottom. It has a fine and not very visible whitish to yellowish network, more greenish close to the base, and turning brown with age..

The flesh is thick, soft, whitish to pale lemon yellow, turning blue quickly when in contact with air mostly in the cap, before fading ; its taste is first mild, then more or less bitter; the odour is weak and spicy;

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

The pores are small, round, lemon yellow, turning blue green when pressed, then turning brown. The spore print is olive brown.

It grows less frequently in northern Europe, and not very often in warmer regions. It privileges woodlands, forest edges or pathsides, on a rather poor and calcareous soil, with beech, oak.

The fruiting period takes place from July to November.
Dimensions: width of cap approximately 14 cm (between 5 and 25 cm)
  height of stem approximately 10 cm (between 5 and 20 cm)
  thickness of stem (at largest section) approximately 45 mm (between 25 and 80 mm)
  spores : 9-16 x 4-6 microns, almost spindle-shaped

Chemical tests : no reaction to iodine or ammonia.

Distinctive features : white to clay-brown cap; yellow pores, turning blue when pressed; yellow and stout stem, without any trace of red, and with a slightly rooting base; flesh with a bitter taste

Boletus radicans is quite rare and localised in the forest of Rambouillet, and is infrequent, more generally speaking .
here should be the distribution map of Boletus radicans in the forest of Rambouillet
Above : distribution map of Boletus radicans in the forest of Rambouillet

page updated on 14/01/18