Nightcap
From Everafter Falls Wiki
Nightcap is a wild mushroom that can be foraged during any season. A Nightcap patch can spawn anywhere in Everafter Falls and has a maximum size of four mushrooms. Fully grown Nightcap patch can be harvested by a green or a rainbow pixie.
Use
Nightcap can be donated to the Museum as part of its Shrooms Of Everafter collection. It has no other use.