Generic short diagnoses:
Tiny 'operculate discomycetes' (?) consisting of hyaline bundles of asci with ornamented, subglobose to broadly ellipsoid, non-amyloid spores. On dung.
Species example:
Ascodesmis nana - overview of fruitbodies on faeces of Fox
The picture originates from the MycoKey 2.0 DVD. Here you will also find a larger picture along with a detailed generic description, references and an interactive, synoptical key to genera.