Cortinarius largus    Fr. 

common name(s) : Big Bellied Webcap, Wide Cortinarius 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Agaricales/Cortinariaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Cortinariales/Cortinariaceae/Cortinarieae [sub-genus:Phlegmacium]  

synonyms: Phlegmacium largum 
(unconfirmed synonyms: Phlegmacium largus)  

edibility : inedible

photo gallery of  Cortinarius largus
photo gallery of  Cortinarius largus potential confusions with  Cortinarius largus toxicity of Cortinarius largus genus Cortinarius  

The cap is pale lilac to blue-grey, then progressively ochre-brown from the centre, convex then expanded; its margin is smooth, incurved for a long time. The cap surface is smooth, viscid, but slightly, becoming silky when dry.

The stem is full, slightly bulbous but with a bulb without ridge, somtimes cylindrical or simply swollen at the base, with a white mycelial down at the base. It is violaceous at first, then only remaining so at the top, becoming more pallid or whitish downwards, with a quite abundant cortina, thin, pale brown.

The flesh is pale lilac-white, turning white in the stem and centre of cap when exposed to air; its taste is mild, tasteless or sweetish; the odour is indistinct to faint, fruity or of iodine; its texture is fibrous.

The gills are pale lilac-blue at first then clay-ochraceous to rust, emarginate to shortly adnate, with a toothed edge, crowded . The spore print is rusty brown. This species is mycorrhizal. It grows on the ground, in deciduous woods, on a rather calcareous soil, most of the time with beech and oak.

The fruiting period takes place from July to November.
Dimensions: width of cap approximately 9 cm (between 3 and 15 cm)
  height of stem approximately 10 cm (between 4 and 15 cm)
  thickness of stem (at largest section) approximately 15 mm (between 10 and 30 mm)

Chemical tests : flesh turning very pale yellow when in contact with potash, or without any reaction.

Distinctive features : pale lilac cap, later becoming ochraceous brown starting from the centre, only slightly viscid; stem with violaceous apex, whitish towards base; lilac gills later becoming ochre to rusty brown; lilac flesh, turning white in stem when exposed to air, with a fruity odour; with beech and oak, on calcareous soils

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

page updated on 14/01/18