The Birch Polypore. Razor Strop Fungus. Birch Bracket. Like many fungi, this one has a range of strange and exotic folk names as well as its scientific name of Piptoporous betulinus. When I was young I knew it as Polyporus betulinus. It’s large, easily recognisable, and growing on this birch tree … Continue reading The Cornish Pasty fungus