Lichen

Lichen

Observation - Lichen - UK and Ireland. Description: Growing on smooth barked tree along with Lecidella eleochroma and Lecanora chlarotera. Patch is 3cm wide. Thick walls to apothecia. Apothecia 700 micrometers wide. Ascus 45 micrometers. Spores 8 - 10 micrometers. Please can you help with ID.

Growing on smooth barked tree along with Lecidella eleochroma and Lecanora chlarotera. Patch is 3cm wide. Thick walls to apothecia.
Apothecia 700 micrometers wide. Ascus 45 micrometers. Spores 8 - 10 micrometers. Please can you help with ID.