Reply by Sodabowski

Dude, that’s spalted something. From the thin lines I would tend to tell ”Xylaria Polymorpha” as for the mushroom that attacked it, which LOVES maple. I have a bunch of lined maple munched up by that very spalter, so I guess it’s one of the possibilities. Another one is beech, with a different mushroom in that case, Fomes Fomentarius. Can you do a close-up in full light so we can see in details? I kinda spy some green in there, which would mean beech + Fomes + Chlorociboria.

-- Holy scrap Barkman!