A perennial resupinate polypore, rusty or grey-brown in colour, with 3 - 6 pores per mm.  There are prominent rust coloured bristles (setae) in the woolly margins of the fruit body - a low power microscope or high magnification hand lens and god light are needed to see these.

Iron porecrust does not have setae on woolly margins

microscopy

Photograph fertile surface to show pores and woolly margin of a specimen to show presence of setae; note host plant and substrate.  If specimen is not examined closely and photographed, identification by an expert from examination of a specimen is needed before submission to NatureSpot. 

Deciduous trees, typically beech and hazel

Occasional in Leicestershire and Rutland.