New records of Graphis from Cameroon, with a key to African species of Graphis

New records of Graphis species are reported from Cameroon, West Africa: G. ajarekarii, G. alboglaucescens, G. brahmanensis, G. daintreensis, G. exalbata, G. gloriosensis, G. gonimica, G. handelii, G. immersella, G. novopalmicola, G. pseudoaquilonia, and G. supracola. The material was collected in the tropical rain forests of Mount Cameroon. The diagnostic characters of the species are briefly discussed and illustrated. An artificial key is provided to facilitate identification of Graphis species known from the African Palaeotropics.