Hello,
I collected this species growing on a rather deteriorated stump of Betula (most likely pubescens) on the 24th of April, in Buskerud county, Norway. I am certain that it was birch wood as it was growing out from the side of a living tree and part of the stump still had identifiable bark attached to it. Some of the wood close to the apothecia was covered with a black "hyphal mat". The apothecia were still immature when I collected the specimen, so I kept it in a moist container for approx 3 weeks until it matured so that I could observe ejected spores.
The diameter of the apothecia is up to 15 mm.

The ascospores are round with granular contents. The spores are placed centrically in the gel sheath, especially in newly discharged spores and in the asci.
10,4–11,8 µm
Mean= 11,12 µm

Asci 8-spored with a long base. The spores are ± evenly spaced in dead asci with granular matter in between them.
275–310 x 14,9–16,5 µm

The paraphyses are mostly cyllindrical, often somewhat bent or ramified at the tips, and measure up to 3,3 µm at the tips. They are more frequently branched and uneven in senescent specimens.

The hairs are wavy to coiled, multiply septate (more closely so near the base), 5-6 µm wide with 1,2-1,5 µm thick walls.

The spore measurements were taken from newly discharged spores in a water mount. All measurements were taken from living cells.

Could this be P. lignicola?

Thank you in advance and best regards,
Hulda