Russula fragilis    (Pers.:Fr.) Fr. 

common name(s) : Fragile Brittlegill, Fragile Russula 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Incertae sedis/Russulales/Russulaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Russulales/Russulaceae  

synonyms: Russula fallax, Russula fragilis-fragilis, Russula fragilis-fallax, Russula emetica-fragilis 
(unconfirmed synonyms: Russula knauthii, Russula gracilis, Russula fragilis-knauthii)  

edibility : inedible

photo gallery of  Russula fragilis
photo gallery of  Russula fragilis potential confusions with  Russula fragilis toxicity of Russula fragilis genus Russula  

The cap is with variable shades : rather violaceous but also red to green or brown; its margin is striate when mature. The cap surface is smooth, viscid in wet weather.

The stem is white, without ring.

The flesh is unchanging; its taste is acrid; the odour is fruity or of acid drops; its texture is grainy (breaking like a chalk stick).

The gills are cream, free, emarginate or adnate, distant . The spore print is white. This species is mycorrhizal. It grows on the ground, in broad-leaved and coniferous woods, on a rather sandy soil, with oak most of the time, but also with birch.

The fruiting period takes place from July to December.
Dimensions: width of cap approximately 5 cm (between 2 and 9 cm)
  height of stem approximately 5 cm (between 2 and 9 cm)
  thickness of stem (at largest section) approximately 10 mm (between 5 and 15 mm)

Chemical tests : flesh becoming pinkish when in contact with iron sulphate; faint or no reaction to Ga´ac; strong purple reaction of cap cystidia to sulpho-vanillin.

Distinctive features : Cap with variable tints : purple, red, green, with a viscid frosty surface; flesh white and very fragile; edge of gills sometimes toothed (use magnifying glass); strong smell evoking coconut, pelargonium or sweets

Russula fragilis is occasional and widely present in the forest of Rambouillet, and is frequent, more generally speaking .
here should be the distribution map of Russula fragilis in the forest of Rambouillet
Above : distribution map of Russula fragilis in the forest of Rambouillet



page updated on 14/01/18