Only thanks to Otto's folders under Lecanorales did I manage to identify this species and as a variant, also known as Dactylospora stygia var. striata. Fairly sure it is although the variant is not accepted by the British authorities under this revised genus nor are there any records that I can find. Can't see why as it has plainly striated spores! Added here not only to confirm if this is correct but also to advise I have 5 apos remaining. Only 7 when found. Description attached. Interestingly growing through the resupinate Hyphodontia alutaria, which is a hypnoid species with vertical cystidia. The asco shows it added some pressure to reach the wood suppressing the cystidia to form a white halo around the apothecia. Just FYI!  Appreaciate confirmation and which species name is correct.

thanks    Tony