Salut,

I have found something strange on twigs of Betula, I think it has similarities with Massaria/Aglaospora or Splanchnonema, but I am not sure about the correct species. I hope someone can help me here ;)

Well here is a description:

Fruitbody sphaerical, grey-brown with hairy outside and a central ostiolus, growing completely under the cortica.
Spores 50-60 x 12- 15 µm, ellipsoid, with 5-6 cells filled with guttules, olivebrown, smooth, centralsepte a bit smaller (constricted? what is the english word for this?), with a distinct gelatinous sheath.
Asci with 8 spores. Paraphyses hyaline.

Many thanks for help ;)

cheers, Kazuya