Lecidella stigmatea (Ach.) Hertel & Leuckert

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On boulder on a playground (#311)

Lecidella cf. stigmatea on a vertical face of a brick in an old wall consisting mainly of sandstone.

The thallus is mainly episubstratic and  appears to be sub-squamulose. Additionally there are polarisation positive, slightly brown globular structures in the hymenium (guttulae) organized in the fashion of spores in asci for which I have no definitive explanation. The other features are compatible with L. stigmatea. If you have ideas on this I'd appreciate any comment.

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