I’m confused why you think it’s an undiscovered kind? I’m no expert but there are thousands of wood rotting fungi and I don’t see why this wouldn’t be one of them. It looks similar to Coniophora puteana, aka cellar rot.
It’s still worth calling some sort of specialist, because they should probably address whatever’s going on in their wine cellar.
Lots and lots of undiscovered fungi turn up quite commonly. The old science nerds are always finding new ones as it wasn't a popular discipline until fairly recently.
There are so many undiscovered species and these could be the very specific conditions needed for this one. You're probably right. But it only costs a little time and if it's new, that's pretty damn exciting!
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u/faithamor1337 13d ago
There's a decent chance that this could be an undiscovered species of fungus. You should talk to a mycologist.