Thyrea confusa

Thyrea confusa is a species of cyanolichen in the family Lichinaceae. The species was formally described in 1990 to provide a correct name for Mediterranean rock-dwelling lichens that had been previously misidentified under an incorrect species name. Thyrea confusa grows as dark, lobed patches on moist calcareous rock faces, typically in Mediterranean climates, and reproduces through both spores and tiny vegetative outgrowths that allow it to spread asexually. The species has a scattered but wide distribution across southern Europe, western Asia, and North America, occurring on limestone and other base-rich rock substrates where cyanolichen communities are common....read more on Wikipedia.