Mycena subcyanocephala is a species of fungus,[1] which has its habitat in the tropical parts of Taiwan. It has been spotted eight times. Mycena subcyanocephala is one of the smallest mushrooms in the world, with buttons about 1 mm tall. The species belongs to the Mycenaceae family, with Mycena interrupta being its closest relative.
Isn’t it slime mold and not a mushroom at all?
It’s a mushroom:
From Wikipedia
It isn’t, but you’re right that slime molds can be this cool!