Hello Everyone,

I have a sample of many individual, erumpent, black fruit bodies on a decorticated branch of Sambucus nigra. Macroscopically and microscopically they seem to most closely resemble the genus Leptosphaeria, but hardly any species grow on wood. 

The spores were hyaline or very pale and becoming 3-septate, even in the ascus and constricted at the septa. Less mature spores had only a few small drops and faint septa developing.

There was no reaction at the ascus tip to Melzers.

I have attached a photo of the fruit bodies and a sketch of the microscopy and wonder if anyone has any ideas.

Thank you,
With Best Wishes,
Peter.