[dragonwriter]

How is fermented tea “mushroom water”?

[ev1]

Old coworkers used to call the growth mushroom as slang for some reason, at least that was the first thing that came to mind.

The other one is a ludicrously overpriced relatively recent beverage called mud water (caffeinated mushroom water?)

[Iwan-Zotow]

In Russian, it is called grib, aka mushroom

[vkou]

Some call the mother colony a 'mushroom'.