Everybody cautious here methinks, still, I'll have a stab, then you can can have a laugh at my expense.
No1. This is growing just how I have seen
Galerina mutabilis growing. So I would have been tempted to opt for this, except the stems look wrong, but perhaps the ring is hidden from view and a lot lower down the stems, but unlikely.
The shot of one on it's own showing the underside seems to be a bit different from those in the clump. Has it been taken from the clump ?
No2. An
Armillaria sp. - maybe
cepistipes ?
No3. If this log had been turned over it could be
Bjerkandera adusta, trouble is, there is now moss growing on the top, which destroys that idea.
Neil