On underside of willow 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.
There are several similar Lecanora's that occur on wood - for a closer ID its necessary to know the results to K and C spot tests and then possibly the P results and microscopy.
The small patches of greenish thallus with black apothecia among it are Lecidella elaeochroma
Many thanks Jenny. I'm just beginning to sort out the few lichens from my photo archive to see how far they can be taken towards an ID, so I appreciate your full explanation of what is needed to get to species here.
And thanks for the ID on Lecidella elaeochroma. It's also part of a lichen mosaic I'm about to post so it will be one less to ask about! :-)
The Lecanora is almost certainly L. chlarotera. Yes, it should be checked with a microscope (just as Lecidella elaeochroma should be checked with a C test (orange)), but these two very commonly grow together.
Lat/Lng: 52.5, -1.2
OS grid ref: SK5600