'Writing' lichen

'Writing' lichen

Observation - 'Writing' lichen - UK and Ireland. Description: Whitish, crustose lichen growing on ridge of bark on oak trunk at about 1.5 m above the ground level. Dark, almost vertical boundary may be prothallus between two adjacent thalli. Brown apothecia showing as dots and short lines. Possibly Enterographa cra

Whitish, crustose lichen growing on ridge of bark on oak trunk at about 1.5 m above the ground level. Dark, almost vertical boundary may be prothallus between two adjacent thalli. Brown apothecia showing as dots and short lines. Possibly Enterographa crassa.