Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Many thanks for that. Do you have time to explain why my ID is wrong? I am really struggling with lichens!
Higher resolution photo posted.
Your high-resolution photo confirms my suspicion. I think.
Why isn't it V. nigrescens? That species has a thinner thallus, divided by cracks into smaller 'islands' (areoles) with a smooth surface. In contrast, P. nigrum is densely covered in isidia, giving it the granular appearance discernable even in the low-res photo. The thallus is also a bit patchy where some of the areoles have fallen away, something that tends not to happen with V. nigrescens.
The blue-black margin (prothallus) of P. nigrum can't be seen here, but is another distinctive feature to look for in the field.
Links to my observations for comparison:
If you enlarge my photo of V. nigrescens, its black, immersed fruit bodies (perithecia) can be seen. When P. nigrum is fertile, it produces different fruit bodies (apothecia) that are disc-like and not immersed. For photos of fertile P. nigrum, see:
Again, notice the prothallus.
Hang on in there; lichens do get easier. Well, a few of them do.
Many thanks Nigel - much appreciated!
Micro moths seems a doddle in comparison!
Lat/Lng: 51.0483, -0.7221
OS grid ref: SU896284