Here is the same mushroom from my last post but 3 days later and photographed from the other side.

I feels like a rock with a rubbery coating.

It seems to be growing what looks like roots?

It doesn't seem like it's dying off, rather it seems to be growing stronger.

It's growing under a pear tree, maybe it's feeding off of dead roots?

I'm thinking maybe a ganoderma?

Here is a closeup and one from the same angle as my last post:

Edit: Here it is 3 days ago: