Two new genera, Myriochapsa M. Cáceres, Lücking & Lumbsch and Nitidochapsa Parnmen, Lücking & Lumbsch, are introduced for the species Chapsa psoromica and C. leprieurii, which are not genuine Chapsa species but related to Myriotrema and Ocellularia, respectively. The following two new combinations are proposed: Myriochapsa psoromica (M. Cáceres, Santos de Jesus & Santos Vieira) M. Cáceres, Lücking & Lumbsch comb. nov., and Nitidochapsa leprieurii (Mont.) Parnmen, Lücking & Lumbsch comb. nov. Myriochapsa psoromica is morphologically and chemically similar to Myriotrema species but differs in the wider apothecial pore with fissured-lobulated margin; it is known only from the western Amazon (Brazil: Rondônia). Nitidochapsa leprieurii is characterized by a brown, nitidous thallus and Chapsa-like apothecia with wide, pruinose disc and lobulate to recurved, felty, white margin; it has brown ascospores and lacks secondary compounds. The species is pantropical. The interpretation of phenotype characters in a molecular phylogenetic framework is discussed.
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Vol. 116 • No. 2