Ascobolus carbonarius is a species of apothecial fungus belonging to the family Ascobolaceae.
This is a European species appearing in spring and summer as olive-brown coloured discs up to 5 mm across on burned ground.
. Michael Jordan (mycologist) . The Encyclopedia of Fungi of Britain and Europe . . 2004 . 34 . 978-0-7112-2379-0.