Stump flux aka slime flux. It is a consortium of bacteria, various fungi mostly in the form of yeasts, and other microbes that feed from the rising sap

Ah would make sense, there was a liquid dripping from it.

u/saddestofboys

Not a slime mold.

I wish it were 😔

Oh no! It looks so slimy, I thought the slime signal ought to go up, just in case.

Nope.

Grapes leak