Latin name: Piptoporus betulinus
The birch polypore, also known as the razorstrop, is a bracket fungus (a fungus which grows on the sides of logs or trees). It is commonly found growing in the Yorkshire Dales National Park in broadleaved woodland on old, on dying or dead silver or downy birch trees between September and November. P. betulinus has a bracket 10–20cm across and 2–6cm thick. It has a rounded shape at first expanding to a hoof-shape. The lower surface has pores rather than gills. They grow annually but remain intact from one year to the next.