Caloplaca cerina (Hedw.) Th. Fr.

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On small branches of Fraxinus sp. forming multiple thalli ca. 0.3-1.0 cm in diametre. 

This is part of my recent (June 2025) dive into "small yellow/orange nightmares",  mostly microlichens with yellow and orange apothecia. Please take my ID suggestion with caution.

Working on this sample led me to the paper 2011 paper by Jaroslav Šoun et al.: Taxonomy and phylogeny of the Caloplaca cerina group in Europe. lichenologist, 43, 2: 113-135. Going from this I would think that my sample, having very small apothecia, could well fit into the clade "C" of Caloplaca cerina s.lat.

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