What is Caloplaca cinnabarina?

This paper treats four saxicolous species of Caloplaca occurring mainly in subtropical or semiarid regions in North and Central America, C. baueri, C. cinnabarina, C. rosei, and C. rubelliana. These species are mainly characterized by 1) a continuous to cracked areolate thallus, 2) thallus without marginal lobes, 3) areole margins broadly attached to the substrate, 4) cortex distinctly paraplectenchymatous, 5) immersed apothecia, and 6) containing anthraquinones. The group is not regarded as natural and consequently not given taxonomic status. Descriptions and distribution maps are provided for the taxa. Color illustrations or references to earlier published color illustrations are provided for all species. Additional notes are presented for two similar non American species, C. haematodes and C. subunicolor