On a dead oak branch.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Graphoid lichens can be difficult - in this case I would want to see the spores before deciding even on genus. "Graphis scripta" quite often isn't.
Shame as they seem so distinctive!
Jamie from Briantspuddle
Lat/Lng: 50.091, -5.138
OS grid ref: SW756259