White rot fungi that will break down the whole log. It is very efficient and needs lots of water and nitrogen.
I was not looking for them, but there they were. Funny how one develops and eye for such things.
Pleurotaceae is a family of small to medium sized mushrooms which have white spores. Members of Pleurotaceae can be mistaken for members of Omphalotaceae. Perhaps the best known member is the oyster mushroom, Pleurotus ostreatus.