In mid July this woodland had some interesting lichen on show. Many looked like the writing lichen. Graphis. The photo above looks like Graphis scripta and the lichen with the dark fruits and rhizines, shown below, Physcia leptalea.
Thelotrema lepadinum below is an indicator species for ancient woodland. Its doughnut fruits look like acorn cups.
A classic version of Graphis scripta below. It prefers smooth barked trees like Hazel.
Above and below depict more scribble lichen, perhaps Graphina anguina below?
Another example of a Opegrapha lichen looks like O atra.
A tableau of lichen: Ramalina fastigiata with the trumpet apothecia; Lecanora symmicta with the flat jade mosaic of apothecia and the common urban sunburst lichen, Xanthoria parietina coloured yellow.
Lastly, another woodland lichen possibly Micarea lignaria.
Warks Burn is noted for much rarer lichen mentioned in the SSSI. My walk through was brief and limited to a few quick photographs.