A polypore

This is the underside of a 'blushing bracket' polypore fungus daedaleopsis confragosa. It differs from many that have orderly rows of neat pores. Instead it has a shallow covering of coral-like apertures, the surface of which will 'blush' to a pink colour if you press on it with a finger. Its aim is to maximise available surface area for the production of spores.
Pentax K1 with a Kieron 90mm macro (AKA Lester Dine). .... Have a look Full Size. It's fascinating.