A large polypore with thin, shiny, chestnut brown caps and dark stems, often attached off-centre.  The pores on the white fertile surface underneath are very small, 4 - 7 per mm.

Photograph from top down, in side view and underneath to show pores and full length of stem; note host plant and substrate

On dead, decaying wood of deciduous trees,

Autumn

Fairly common in Leicestershire and Rutland.