Tectaria × amesiana A.A.Eaton (1906:479)

Ames' halberd fern

Taxonomy & Nomenclature

Synonyms: Aspidium trifoliatum var. amesianum Clute in Fern Bull. 16: 82 (1908); Aspidium amesianum Christ in Geogr. Farne: 301 (1910)

Conservation Status

Extinct (Gann et al., 2001-2024; Gann et al., 2002:106)

Last record: 1940 (Gann et al., 2001-2024; Gann et al., 2002:107)

Distribution & Habitat

Florida, USA

Anatomy & Morphology

Biology & Ecology

Hypodigm

Media

References

Avery, G. N. and Loope, L. L. (1980). Endemic taxa in the flora of South Florida. South Florida Research Center Report T-558. Homestead: Everglades National Park.

Flora of North America Editorial Committee. (1993). Flora of North America, Volume 2, Pteridophytes and Gymnosperms. New York/Oxford: Oxford University Press.

Gann, George D., Bradley, Keith A. and Woodmansee, Steven W. (2002). Rare Plants of South Florida: Their History, Conservation, and Restoration. Miami, Florida: The Institute for Regional Conservation. xiv + 1056 pp.

Gann, George D., Trotta, L. B. and Collaborators. (2001-2024). Floristic Inventory of South Florida Database Online. The Institute for Regional Conservation. Delray Beach, Florida.

Lakela, O. and Long, R. W. (1976). Ferns of Florida. Miami: Banyan Books.

Long, R. W. and Lakela, O. (1976). A Flora of Tropical Florida. Coral Gables: University of Miami Press.

Nelson, G. (2000). The Ferns of Florida. Sarasota: Pineapple Press.

POWO. (2024). Plants of the World Online (online resource). Facilitated by the Royal Botanic Gardens, Kew, United Kingdom. Available at: https://powo.science.kew.org/ [Accessed 10 July 2024]

Small, J. K. (1931). Ferns of Florida. New York: The Science Press.

Small, J. K. (1938). Ferns of the Southeastern States. Lancaster: The Science Press.

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.

Weakley, A. S. and SFT (Southeastern Flora Team). (2026). Flora of the southeastern United States Web App. University of North Carolina Herbarium, North Carolina Botanical Garden, Chapel Hill, U.S.A. https://fsus.ncbg.unc.edu/main.php?pg=show-taxon-detail.php&lsid=urn:lsid:ncbg.unc.edu:taxon:{08BB911D-8B48-4B17-A530-47485E05657B}&tempaccesskey=107118019. Accessed Aug 21, 2026.

Wunderlin, R. P. (1998). Guide to the Vascular Plants of Florida. Gainesville: University Presses of Florida.

Wunderlin, R. P. and Hansen, B. F. (2000). Flora of Florida, Volume 1. Gainesville: The University Presses of Florida.

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