Lichen (Evernia prunastri)
This amazing lichen is very common and I have no doubt we all pass it by with hardly a glance. However, it has been used as a fixative for perfume, a dying agent, it was ground up to make a hair powder and was used as wadding in shotguns.
Nowadays it is a known source of usnic acid and is used in the production of antibiotics. It is also the preferred lichen used by Long-tailed Tits in their nests.
So,next time you take a winter walk in the woods, why not take a closer look at lichen, you find more than you bargained on.