Diploschistes and Solenopsora?

Two crustose lichens from the west-facing wall of a poured concrete barn – but frustratingly I had no chemicals or means of collecting with me!

Q1. Two white (possibly) pruinose thalli with urceolate apothecia.

Either Diploschistes gypsaceus but the habitat doesn’t seem to fit with the LGBI3 description of “hard, often vertical calcareous rocks, especially limestones, in somewhat shaded and damp situations”.

Diploschistes scruposus is the better possibility as the habitat details fit better “on siliceous or somewhat basic rocks and walls, often in nutrient-enriched sites”.

I assumed the thallus was pruinose but looking again I’m no longer at all certain.

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Q2. With a pruinose thallus, the +/- convex pale pink-beige apothecia appearing lecanorine with the remnants of thin thalline margins. I’ve come across Solenopsora candicans in Dorset churchyards with pinkish-beige rather than black apothecia but can’t find the photographs I took to compare with.

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