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. References

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Pezizales
Fungi described in 1857