Prodromus of a fern flora of Bolivia. XLII. Update I. Author Kessler, Michael Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, CH- 8008 Zurich, Switzerland. Author Smith, Alan R. University Herbarium, 1001 Valley Life Sciences Bldg. # 2465, University of California, Berkeley, CA 94720 - 2465. Author Øllgaard, Benjamin Department of Biology - Ecoinformatics and Biodiversity, Ny Munkegade 116, building 1137, 8000 Aarhus C, Denmark. Author Matos, Fernando B. Centro de Referência em Informação Ambiental (CRIA), Rua João Carlos do Amaral 500, 13070 - 111, Campinas, SP, Brasil. Author Moran, Robbin C. New York Botanical Garden, 2900 Southern Blvd., Bronx, New York, 10458 - 5126, USA. text Phytotaxa 2023 2023-12-20 630 3 183 210 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.630.3.2/51376 journal article 10.11646/phytotaxa.630.3.2 1179-3163 10409920 Ophioglossaceae In their treatment of Bolivian Ophioglossaceae, Kessler & Smith (2017b) treated seven species in four genera, with Ophioglossum containing four species, including O. crotalophoroides . More recently, Zhang & Zhang (2022) , based on a combination of molecular and morphological data, have proposed to split Ophioglossum into four genera including three new ones: Goswamia , Haukia , and Whittieria . Zhang and Zhang (2022) justified the separation of the new genera based on molecular divergence that is higher than among other genera currently recognized in the family, an early divergence age of over 100 Ma, and morphological distinctness. If accepted, O. crotalophoroides would belong to genus Haukia , However , the four genera together form a monophyletic clade, so that maintenance of Ophioglossum in a broader sense is also tenable. Further, some of the traits used to characterize the genera, such as preferences for certain soil types , or the spore germination time, appear weak to us. The segregation of the new genera has not yet been widely accepted (e.g., not by Hassler 2004 –2023), and we prefer to maintain the four Bolivian species in Ophioglossum for the time being.