Russula betularum

It is usually white to very pale pink, inedible, and grows with birch trees.

The stem is typically longer than the diameter of the cap, and is cylindrical or slightly club-shaped.

However, the cuticle of the latter species is only three quarters peeling, usually darker at the centre, and with purplish tones.

[2] Many bitter tasting red-capped species can cause problems if eaten raw; the symptoms are mainly gastrointestinal in nature: diarrhoea, vomiting and colicky abdominal cramps.

The active agent has not been identified but thought to be sesquiterpenes, which have been isolated from the related genus Lactarius and from Russula sardonia.