Boletus luridus    Schaeff.:Fr. 

common name(s) : Lurid Bolete 

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

synonyms: Suillellus luridus, Boletus luridus-luridus, Tubiporus luridus 
(unconfirmed synonyms: Boletus rubeolarius)  

edibility : edible if well cooked

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

The cap is of variable colour, hard to define : buff-green, dirty yellow to pale brown, reddish at animal bites, fleshy, thick, of convex shape, getting more or less flattened. The cap surface is dry, matt, downy then smooth. The cap margin is inrolled young, then more or less irregularly wavy.

The stem is sturdy and full, more or less equal or swollen at the base, slim or on the contrary stocky (short and swollen in young specimens). It is yellow at the top, orange-yellow then brown towards the base (the stem looks like being red, because of the blood-red network). The stem turns blue strongly when touched, particularly in the youth. It is covered with a blood-red (brown with age) network with large mesh cells elongated towards the base..

The flesh is thick, firm, pallid to apricot yellow, reddish in the stem base. It turns green-blue quickly when in contact with air. Interesting identification criterion of this species: when cutting off a slice of the cap, just before the change of colour to blue, a fine red-orange line can be seen just above the tubes, on the yellow background of the flesh.; its taste is mild or faint; the odour is pleasant or weak;

The tubes are thin, free, removable in small blocks, long (20-35mm), yellow then greenish, round, turning blue-green when exposed to air.

The pores are small, round, orange-red (red very early), then yellowish when getting paler with age, turning strongly dark blue when pressed. The spore print is dark olive brown.

It grows in well ventilated areas of coniferous or deciduous woods: woodlands, pathsides, clearings or wood edges, but also in parks, on a rather rich, calcareous or neutral soil, with beech, oak, birch.

The fruiting period takes place from April to November.
Dimensions: width of cap approximately 12 cm (between 5 and 25 cm)
  height of stem approximately 12 cm (between 4 and 20 cm)
  thickness of stem (at largest section) approximately 25 mm (between 10 and 50 mm)
  spores : 11-16 x 4,5-7 microns, spindle-shaped to ellipsoid

Chemical tests : positive reaction to iodine (flesh becoming dark blue) and to ammonia (flesh becoming ochre).

Distinctive features : when cap sliced, a red marking on yellow background appears just above the tubes, before the flesh turns intensely blue; raised blood-red network on stem, the mesh being stretched towards stem base; brownish cap; red pores, turning quickly deep blue when pressed

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

page updated on 14/01/18