… by genus: Caloplaca
Greek: Calos means nice, placa is shield. Caloplaca means ‘beautiful patches’. This group is generally yellow or orange, although a few species are white, grey, greenish or even brown. They are crustose placodioid lichens closely attached to the substrate. Approximately 1000 species are known worldwide ranging from coastal habitats to mountains and from the tropics to polar regions. Substrates include rocks, trees, sawn wood and soil. In Ireland they are mainly found on calcareous and silica rich rocks. Some species of Caloplaca are parasitized by lichenicolous fungi. They are almost all K+.