A relatively large (up to 1.5 cm) yellowish-brown Rutstroemia, with a short stalk that darkens at the base.  Initially cup-shaped, it expands and flattens.  The outside of the cup is the same colour as inside, and the margin of the cup is slightly crenulate.  

Photograph on host plant; note substrate and associated plant species.  

On dead and rotting wood, often oak, but also other deciduous trees 

Autumn to early winter.