Caloplaca lamprocheila (DC.) Flagey
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Caloplaca arenaria (Pers.) Müll. Arg. Granite firedot, sandwort orange lichen
Granite firedot lichen occurs worldwide. Identification: This rock-dwelling lichen is so thin that it looks at first like rust on the rock. It appears most commonly on granite, but can appear on other non-calcareous rocks. Its fruiting structures (apothecia) are dark red and very small, less than a millimeter across, wide and flat, like irregular tiles, without the white powdery covering that occurs in some other lichens. This is the only rock-dwelling lichen with such a dark red appearance. Online References:
The Consortium of North American Lichen Herbaria Caloplaca arenaria description by Thomas H. Kent, last updated 25 May 2020.
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7/30/2023 · Point Lookout, Lincolnville, Maine
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ID is uncertain 