this one is especially interesting for me because it is the host of an Unguiculariopsis that I plan to show here soon. First, I would like to know more about hte host. Growing on Quercus (Germany, Baaria), attached twigs at lying middle-aged log. The stromata contain some perithecia with white content (hyaline spores at least for long time). The asci are iodine-negative and bear croziers. There are plenty periphyses. The spores are for a long time hyaline, with the second cell distinctly enlarged, and measurea about 19-23/4-5,5 µm. 
The pink color in the fotos is from phloxine (mixed with water). 
Can somebody help me with the identification?
Best regards, Lothar