Coprinopsis lagopus is a species of fungus in the family Psathyrellaceae. It is a delicate and short-lived fungus, the fruit bodies lasting only a few hours before dissolving into a black ink – a process called deliquescence or auto digestion.

Coprinopsis lagopus grows solitarily or in groups in soil as well as on wood chips, compost heaps, vegetable refuse, or horse dung, from autumn to mid-winter. It has a widespread distribution throughout the world. This specimen was found growing from a damp mossy and leaf littered soil on Rakiura / Stewart Island with a few other coprinopsis lagopus in the vicinity.