New species and records of tropical microlichens from Argentina, Brazil, Ecuador, Madagascar and Papua New Guinea.

The following tropical microlichen species are described new to science: Acanthotrema sorediatum from Brazil, Coenogonium megasporum from Papua New Guinea, Glaucotrema inspersum from Brazil, Glaucotrema negativum from Brazil, Micarea resinoides from Papua New Guinea, Micarea viridibotryoides from Papua New Guinea, Myriotrema defectofrondosum from Brazil, Ocellularia suprafricana from Brazil, Ocellularia uniseptatoides from Brazil, and Piccolia perithecioidea from Argentina. Some other species are reported new to Argentina, Brazil or one of more of its states, Ecuador, Madagascar and/ or Papua New Guinea. [ABSTRACT FROM AUTHOR]