The new combination Diorygma antillarum (Vain.) Nelsen, Lücking & Rivas Plata is proposed. This taxon lacks ascomata and produces unique isidia-like structures for vegetative dispersal. Its systematic position was clarified by incorporating molecular sequence data from the small subunit of the mitochondrial ribosomal DNA (mtSSU) and small and large subunits of the nuclear ribososomal DNA (nuSSU and nuLSU). Our phylogenetic hypotheses suggest this taxon is not part of Herpothallon in the class Arthoniomycetes, but is supported as a member of the genus Diorygma (Graphidaceae) in the class Lecanoromycetes. This agrees with morphological and chemical features of this species.
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Vol. 115 • No. 2