Grey foliose lichen with brown underside, growing on hawthorn.
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.
Not a lot of this is in focus but at least one lobe (mid right) appears to have marginal cilia. Is this consistent with H. revoluta? Not being critical just curious.
Those are rhizines originating from the lower surface. H. revoluta is rhizinate to the margins, whereas Parmotrema spp. have a marginal zone with no rhizines, but sometimes have cilia. Apparently H. revoluta can, rarely, have sparse marginal cilia too, but these aren't them.
Good to see that we are provided with a note of the colour of the underside. It being brown is useful confirmation that this is H. revoluta and not H. afrorevoluta (black underside except near the margins).
Lat/Lng: 51.3, -2.4
OS grid ref: ST7261