Stereum rugosum on Hornbeam

 This extensive Stereum growth on a Hornbeam stump growing from an old coppice stool is more likely to be Stereum rugosum than Stereum gausapatum. 

It is generally accepted that gausapatum is generally to be found on oak, although it can also be found on a few other trees such as hazel, birch, beech, sweet chestnut. Stereum rugosum however is commonly called the Broadleaf Bleeding Crust because of its much wider host range. It is difficult to know how reliable all this information is, but the indicators of a fairly light colour, little obviously pale margining and the presence of a degree of cap formation with a black upper surface all tip the balance towards Stereum rugosum.

The literature can be confusing. For example Bernicchia doesn't even mention the suggestion that rugosum can be a multilayered perennial, and says that the crust is only up to 1 mm thick.