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Coêlho, J. M. S.; Lehmkuhl, E. A.; Araújo, C. C. A. D.; Ludwig, T. A. V.; Silva-Lehmkuhl, A. M. D. (2024). Actinella gessneri Hustedt (Eunotiaceae, Bacillariophyceae), a rare and endemic species in Amazonian blackwater, Brazil. Phytotaxa. 636(2): 163-174 LM and MEV figures.