Jersey cow mushroom - Suillus bovinus

Meerdaelbos, Belgium (Oct 2014).
The cap of Suillus bovinus is initially convex, then flat with a wavy margin and a grey-yellow in colour. The flesh is whitish or yellowish and the pores are irregular and grey- to olive-yellow and generally decurrent to the 4–6 cm tall stem, which is a similar colour to the cap and smaller towards the base. The flesh is very spongy and foam rubber like to the extent that it is often possible to bend the cap double without breaking it.