Porpidia cinereoatra

I found this group difficult and for me needed a lot of care and cross checking. The enclosed measurements were needed to get to my conclusion.
Hymenium: 112µm
Epithecium: 20µm
Spores: 15x7.5µm

Porpidia cinereoatra

Porpidia cinereoatra section

Porpidia cinereoatra section showing 2.5µm ruler

Porpidia cinereoatra through microscope

Porpidia cinereoatra ascus showing KI reaction