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Caloplaca ignea is the orange lichen (also called the flame lichen), the yellow one is probably Caloplaca citrina. This granite boulder is a typical habitat.
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Two species, maybe the orange one is Caloplaca ignea, the other Caloplaca citrina.
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The areolar structure of Caloplaca ignea - the flame lichen.
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Section through an areole of Caloplaca ignea shows the thinck orange layer over the top of the lichen, but also showing the green chlorophyte algae living among the hyphae of the fungal mycelium.
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Section through an areole of Caloplaca ignea shows the thick orange layer over the top of the lichen, but also shows the algae living within the internal region with its fungal mycelium.
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This is the growing margin of the lichen, extending over the surface of a granite rock.
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Detail of the areoles of the flame lichen.