If you’ve ever seen one when walking through the woods, the Lion’s Mane mushroom, a cream-white shaggy mass that looks almost alien-like nestled among the underbrush, is instantly recognisable. In the UK, it is traditionally known as Old Man’s Beard, and it is easy to see why, as it hangs, growing on the decaying hardwood trunks of oak, beech and walnut trees, it’s white tendrils casually drifting towards the floor.