Adrian Davies / Wood hedgehog fungus (Hydnum repandum) ring in deciduous woodland. Surrey, England, UK. September, 2017.

David Kjaer / Hedgehog fungus (Hydnum repandum) Hampshire, UK

Adrian Davies / Wood hedgehog (Hydnum repandum) fungi, upturned to show spines, Surrey, England, UK, September.

Adrian Davies / Wood hedgehog (Hydnum repandum) fungi, upturned to show spines, Surrey, England, UK, September.Edible

Adrian Davies / Wood hedgehog (Hydnum repandum) fungi growing in woodland, Surrey, England, UK, September. Edible

Adrian Davies / Close up of the underside a Wood hedgehog fungus (Hydnum repandum), showing its teeth-like spore-bearing structures, Surrey, England, UK, October.

Philippe Clement / Wood hedgehog / Hedgehog mushroom (Hydnum repandum), Belgium

Philippe Clement / Wood hedgehog / Hedgehog mushroom (Hydnum repandum) showing spines on underside of cap, Belgium

Nigel Bean / Hedgehog fungus {Hydnum repandum} in woodland, UK

Nigel Bean / Hedgehog fungus {Hydnum repandum} in woodland, UK

George McCarthy / Hedgehog fungus {Hydnum repandum} UK

Nigel Bean / Mixed harvest of edible wild mushrooms including Hedgehog mushroom (Hydnum repandum), Trumpet chanterelle (Canthrellus tubaeformis), Meadow waxcap (Hygrocybe pratensis) and Bay bolete (Boletus badius)...