A survey of cyanolichen species occurring in Cananéia, Cardoso, Comprida and Ilhabela Islands of São Paulo State, Brazil, revealed the occurrence of sixteen species belonging to the genus Leptogium. The survey is based on literature review and on newly collected material. Two species (L. milligranum and L. sulcatum) are newly reported for Brazil and two others (L. atlanticum and L. denticulatum) for the studied islands, while L. azureum, L. cyanescens, L. isidiosellum and L. moluccanum were recollected by us. Descriptions for all insular species, along with an identification key are also presented.
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