The predominant genera of recycled fibre pulps and process water were Penicillium, Trichoderma, Aspergillus, Mucor, Paecilomyces and Geotrichum. Yeasts were rare in the samples. The drying stages of the paper and boardmaking processes eliminated very effectively all the fungi present.
Suihko, M-L., & Hoekstra, E. S. (1999). Fungi present in some recycled fibre pulps and paperboards. Nordic Pulp and Paper Research Journal, 14(3), 199-203. https://doi.org/10.3183/NPPRJ-1999-14-03-p199-203