A lemon-yellow lichen with a placodiod thallus, the edge of which is made up of tiny lobes, while the centre is made up of granules or isidia. The species resembles the common Caloplaca decipiens that, however, usually forms soralia, has an orange tinge and turns violet with KOH. This saxicolous lichen grows on both natural and anthropogenic substrates, most often on limestone rocks, concrete and other calcium-enriched rocky substrates. The species has a prominent preference for rock tops, often enriched with nutrients from bird excrements. The centre of its distribution is in the Mediterranean, from where it gradually radiates northwards. In the Czech Republic, it belongs to relatively rare lichens. It is relatively common in the Pálava region. Other localities are only sparsely scattered in areas with calcareous bedrock (e.g. the karst areas of Český kras and Týnčanský kras and limestones in the Šumava foothills).taxonomic classification:
All records: 29, confirmed 29. One click on a selected square displays particular record(s), including their source(s).