MERCADO-DÍAZ, J. A., R. LÜCKING, and S. PARNMEN. “Two New Genera and Twelve New Species of Graphidaceae from Puerto Rico: A Case for Higher Endemism of Lichenized Fungi in Islands of the Caribbean?”. Phytotaxa, vol. 189, no. 1, Dec. 2014, pp. 186–203, doi:10.11646/phytotaxa.189.1.14.