Dryopteris ascensionis (Hook.) Kuntze (1891:812)
Taxonomy & Nomenclature
Synonym/s: Nephrodium ascensionis Hook. in Sp. Fil. 4: 124, t. 257 (1862); Aspidium ascensionis (Hook.) Kuhn in Filic. Afr. 126 (1868); Lastrea ascensionis (Hook.) J.Sm. in Hist. Fil. 215 (1875)
Conservation Status
Extinct (Baillie & Butcher, 2012:88; Lambdon et al., 2012; POWO, 2023; Christenhusz & Govaerts, 2024)
Last record: August 1889 (specimen) (Cronk, 1980:207); 1975 (sighting) (Cronk, 1980:214; Roux, 2013; Hassler, 2004-2023; contra Lambdon et al., 2012); 1976 (Christenhusz & Govaerts, 2024)
IUCN RedList status: Extinct
Distribution
Green Mountain area, Ascension Island
Biology & Ecology
Hypodigm
Media
References
Ascension Environmental Information Operations Utility. (2010). Annual plant census data. Georgetown, Ascension Island.
Ashmole, P. and Ashmole, M. (2000). St Helena and Ascension Island: a natural history. Anthony Nelson, Oswestry, U.K.
Baillie, Jonathan E. M. and Butcher, Ellen R. (2012). Priceless or Worthless? The world’s most threatened species. London, UK: Zoological Society of London.
Christenhusz, Maarten J. M. and Govaerts, Rafaël. (2024). Plant extinction in the Anthropocene. Botanical Journal of the Linnean Society. https://doi.org/10.1093/botlinnean/boae045 [Appendix S1]
Cronk, Quentin. C. B. (1980). Extinction and survival in the endemic flora of Ascension Island. Biological Conservation 17(3): 207-219. https://doi.org/10.1016/0006-3207(80)90056-7
Duffey, E. (1964). The terrestrial ecology of Ascension Island. Journal of Applied Ecology 1: 219-251.
Gray, A., Gardner, S., Kirk, L., Robinson, P., Smölka, Z. and Webster, L. (2000). The status and distribution of the endemic vascular flora of Ascension Island. Unpublished Report.
Gray, A., Pelembe, T. and Stroud, S. (2005). The conservation of the endemic vascular flora of Ascension Island and the threats from alien species. Oryx 39(4): 1-6.
Hassler, Michael. (2004-2023). World Ferns. Synonymic Checklist and Distribution of Ferns and Lycophytes of the World. Version 17.2; last update Oct. 18th, 2023. Available at: https://www.worldplants.de/ferns/ [Accessed 22 October 2023]
Hooker, J. D. (1867). On insular floras (British Association 1866). Gardener’s Chronicle 3: 50.
Hassler, Michael. (2004-2023). World Ferns. Synonymic Checklist and Distribution of Ferns and Lycophytes of the World. Version 17.2; last update Oct. 18th, 2023. Available at: https://www.worldplants.de/ferns/ [Accessed 22 October 2023]
Lambdon, P. W., Stroud, S., Gray, A., Niissalo, M. and Renshaw, O. (2012). Dryopteris ascensionis. The IUCN Red List of Threatened Species 2012: e.T43920A2989932. https://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T43920A2989932.en. Downloaded on 17 November 2016.
Packer, J. E. (2002). A concise guide to Ascension Island. South Atlantic Ascension Heritage Society, Georgetown.
POWO. (2023). Dryopteris ascensionis (Hook.) Kuntze. Plants of the World Online (online resource). Royal Botanic Gardens, Kew, United Kingdom. Available at: https://powo.science.kew.org/ [Accessed 22 October 2023]
Roux, Jacobus P. (2013). The fern genus Dryopteris (Dryopteridaceae) in Ascension and Saint Helena islands, Atlantic Ocean. Phytotaxa 118(2): 43-55. https://doi.org/10.11646/phytotaxa.118.2.3
Royal Botanic Gardens, Kew. (2009). Data extracted from notes accompanying collection of herbarium specimens. Accessed 2009. Royal Botanic Gardens, Kew, London.
Vojtek, Ján. (2020). Refining extinction estimations for plants of the UK Overseas Territories (UKOTs). MSc dissertation, Queen Mary, University of London. https://doi.org/10.34885/185
Walter, Kerry S. and Gillett, Harriet J. (eds.). (1998). 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre. Gland, Switzerland & Cambridge, UK: IUCN – The World Conservation Union. lxiv + 862 pp.
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