Do not seem to be able to identify this lichen, even the colour does not match anything. It's growing in recesses at the bottom of our dry stone wall.
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Lepraria ecorticata is a possibilty but I'm struggling myself with these leprose ones!
Tried the chemical tests and got K-, C- and KC+ immediate yellow colour.
Just looked on http://www.irishlichens.ie/pages-lichen/l-332.html and that does match.
But the lichen has no other features I can see other than being like a thin layer of fine powder and it is the right colour.
Does not seem much to say definitely it is or is not L. ecorticata?
Wildlife of Assynt
The full description for L. ecorticata in the 'Lichens of Great Britain and Ireland' by Smith et. al. is:
"Thallus diffuse, pale yellow-green, locally bluish grey in deep shade, thick thalli becoming cracked; granules 0.04-0.1(-0.12) mm, without projecting hyphae, firm in appearance; medulla absent. C-, K-, KC+ pale yellow, Pd-, UV-, (usnic acid, +/- fatty acid, +/- atrocin, +/- zeorin); thallus developing fine crystals on the surface during storage in the herbarium.
On acidic siliceous rocks below overhangs, extending deeply into crevices, on cliffs, below boulders and on drystone walls, frequent in N and W Britain, from Scilly Isles to W. Scotland, W Europe, N America.
Distinguished in the field by the finely granular, yellow-green thallus on acidic rocks.
Psilolechia lucida differs in the brighter yellow-green colour. Lecanora orosthea differs in the presence of a prothallus and corticate areas of thallus."
On the basis of probability it is most likely to be Lepraria ecorticata but I don't have enough experience to say for definite!
Comparing the description in 'Lichens of Great Britain and Ireland' this lichen has a ---
Thallus blueish- green, powdery.
I think the photo does shows some cracking o thalli
Chemical tests shows K-, C- and KC+ immediate yellow colour.
The lichen is only growing in protected recesses on the north side of our dry stone wall, and I can see the thallus deep into the wall.
Based on this I will opt for a strong probability that it is Lepraria ecorticata.
Unless I hear more --------------------
I am not sure about Lepraria incana although it's common name is Dust lichen.
When I looked on http://www.irishlichens.ie/pages-lichen/l-164.html, it did not seem to match.
The Irish site says L. incana is Chemical negative, mine was K-, C- but KC+ immediate yellow colour.
It also says the thallus comprised of very small fluffy granules whereas this is a very fine powder.
I am still thinking Lepraria ecorticata is more likely.
Lat/Lng: 58.1, -5.3
OS grid ref: NC0720