A revision of neotropical specimens of the genus Carbacanthographis (Graphidaceae, lichenized fungi) revealed the presence of 14 undescribed species: Carbacanthographis bulbosa, C. clandestinospora, C. cristata, C. denudata, C. granulosa, C. inspersomarcescens, C. isidiata, C. latisporoides, C. lucidocleitops, C. minutissima, C. multiseptatoides, C. nigra, C. nitida, and C. protocristata. They are presented below. The genus appears to have a diversity center in semideciduous forests of northern South America, with up to 7 different species on a single tree. Key words: altitudinal zonation, lichen systematics, primary forest, semi-deciduous forest, tree inventory.