I took the following specimen
It yielded these spores (magnification x600, field width 86um):
I used a razor blade to cut open some of the perithecia. One of them was filled with milky water and was lined with asci (magnification x60, field width about 860um, reflected light):
In the following close-up you can make out the developing spores in the asci (magnification x150, field width about 344um, reflected light):
First photo and specimen taken in Whiteknights Park, Reading, UK, on 2014-02-02.