JennyS
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Looking at last nights sections (all in K) the spores were now pale brown 
[attachment=1]z Melaspilea Q 250130-11.jpg[/attachment] but the asci tips weren’t K/I+ blue when I removed the cover slip and added a drop of Melzers
[attachment=0]z Melaspilea Q 250130-13 Melzers.jpg[/attachment] In this case, and despite the erumpent apothecia, is it just Melaspilea ochrothalamia?
It looks like ones I found on an Ash twig in Co.Limerick, Ireland in August and recorded as Diplotomma pharcidium, the spores 3-septate becoming sub-muriform, 14-20 x 7-9.5 µm: 
[attachment=2]l-575a2.jpg[/attachment] 
[attachment=1]l-m575a2.jpg[/attachment] 
[attachment=0]l-m575a4.jpg[/attachment] That was my dilemma too, and I had originally noted it down in 2010 as either Physcia clementei or stellaris. Its hard to tell from the photograph as the thallii are covered with apothecia initials but when I came across the photo yesterday I thought the top left thallus did have clumps of rather coarse isidia.
But yes, looking again the lobes of mine are broader and more over-lapping than those in Alain’s photos, and more like stellaris lobes!
[attachment=0]Physcia clementii 1009020097 q isidia.jpg[/attachment] Thank you both but I think I must have got well and truly side-tracked with this one! Specimen below was both K/UV(wet) and K/UV(dry) negative, also K-, C-, KC- and UV-.
Reverting to my original thought of Lecanora I checked sections in water under polarised light but no crystals in the margins or granules in the epithecium. The asci were 8-spored, spores simple 8-12.5 x 5-6(-7) µm.
This could fit with Myriolecis (Lecanora) hagenii but that’s a species I’m unfamiliar with?
[attachment=2]zz q Lec not Traponora 240828 004.jpg[/attachment] 
[attachment=1]zz q Lec not Traponora 240828-1.jpg[/attachment] 
[attachment=0]zz q Lec not Traponora 240828-1b.jpg[/attachment]
