Abstract
Graphis robertusii (G. robertusii) Bárcenas-Peña, Herrera-Campos and Miranda is described for the first time from the tropical rain forest in Los Tuxtlas, Veracruz. It is a conspicuous species characterized by erumpent lirella with lateral thalline margin separated from the excipulum, labia entire and white pruinose, completely carbonized excipulum, inspersed hymenium, transversally septate spores, and stictic, salazinic and constictic acids as secondary metabolites. G. robertusii was found on cortex at the canopy of several sites within Los Tuxtlas Biosphere Reserve, Veracruz and it is one of the most abundant corticolous crustose lichen species in the region.
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