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Abstract
An artificial group of 17 species of Caloplaca is treated for North and Central America. The group includes those species of the genus with brown or black apothecia and with a KOH- thallus and KOH- or KOH+ purplish epihymenium. The K+ purplish reaction is distinguished from the K+ red reaction in those species with parietin complex. A key for the species treated is presented along with diagnoses and distributions. Critical notes are given for many other species in this group from other parts of the world. Four new species are described: Caloplaca brunneola, C. dakotensis, C. neotropica, and C. parvula. New combinations are made for Caloplaca albovariegata, C. diphasia, and C. oblongula. Caloplaca conversa is reported for the first time from North America.