Ochrolechia parella?

Ochrolechia parella?

Observation - Ochrolechia parella? - UK and Ireland. Description: On a stone bridge wall, probably granite though not sure; whitish (in some of the other patches)a dirty brownish-white crustose lichen.

On a stone bridge wall, probably granite though not sure; whitish (in some of the other patches)a dirty brownish-white crustose lichen.