Leptogium (Collemataceae, Peltigerales) from Mato Grosso do Sul state, Brazil: nine new records, three new taxa and a key for the species

The diversity of Leptogium has been underestimated in Mato Grosso do Sul, Brazil. Nine species are being reported for the first time to the state, including L. microcarpum, as new record to Brazil; and L. cyanizum, as new record to the American continent. Furthermore, L. hondae, L. moluccanum var. denticulatum and L. quilombensis are proposed as new to science. The first key to species of Leptogium is provided for this region, which can also be used for surrounding regions in Brazil.