Ascobolus brassicae

Ascobolus brassicae is a species of apothecial fungus belonging to the family Ascobolaceae.

This is a European species appearing as tiny off-white (later turning purple) discs, with toothed edges, up to 1 mm across on animal dung, especially that of rodents. It is also found on rotting Brassica stems which gives rise to the specific name.