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This multidisciplinary research combines knowledge in molecular biology with fungal morphology, aiming at the identification of infecting fungi from historical documents on the Archive of the University of Coimbra. The identification of infecting fungi on several bibliographic documents and support materials was based both on ribosomal DNA loci amplification and sequencing, and morphological identification, using macro- and microscopical traits. A high fungal diversity was found in all types of support: parchment, laid-paper and wood-pulp paper. Fourteen fungal genera were isolated, identified, and kept in culture. The most frequent were Cladosporium, Penicillium and Aspergillus, and other less frequent genera, such as Alternaria, Botrytis, Chaetomium, Chromelosporium, Epicoccum, Phlebiopsys and Toxicocladosporium were also present. Within these genera, 20 different species were identified, from which 15 …