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Home/Species/ Willdenow's Maidenfern

Cyclosorus interruptus

(Willd.) H. Ito

Willdenow's Maidenfern

G5Secure (G5?) Found in 1 roadless area NatureServe Explorer →
G5SecureGlobal Rank
Least concernIUCN
Identity
Unique IDELEMENT_GLOBAL.2.143175
Element CodePPTHE050Q0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
IUCNLeast concern
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumFilicinophyta
ClassFilicopsida
OrderFilicales
FamilyThelypteridaceae
GenusCyclosorus
Synonyms
Thelypteris interrupta(Willd.) K. Iwats.
Other Common Names
Willdenow's maiden fern (EN)
Concept Reference
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Taxonomic Comments
Fawcett and Smith (2021) treat Thelypteris interrupta, as recognized in FNA (1993, vol. 2), as Cyclosorus interruptus. Some sources, e.g., Weakley and the Southeastern Flora Team (2025) and POWO (2025), treat New World plants as a separate species, Cyclosorus gongylodes, from the Old World C. interruptus. More definitive taxonomic analyses are needed to determine if New World plants are distinct from Old World plants. The generic placement of this taxon, in Cyclosorus, is in accordance with the Pteridophyte Phylogeny Group I (2016).
Conservation Status
Review Date1988-12-15
Change Date1988-12-15
Edition AuthorsBeckman, J. (5/96)
Range Extent Comments
Data for T. interruptus in Valier (1995) indicates fern is indigenous to Hawaiian Islands.
Occurrences Comments
Data for T. interruptus in Valier (1995) indicates common within its preferred habitat.
Ecology & Habitat

Habitat

Data for T. interruptus in Valier (1995) indicates terrestrial in swampy areas up to 1220m.
Other Nations (1)
United StatesNNR
ProvinceRankNative
LouisianaS1Yes
HawaiiSNRYes
FloridaSNRYes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (1)
Florida (1)
AreaForestAcres
Alexander Springs CreekOcala National Forest2,954
References (6)
  1. Fawcett, S., and A.R. Smith. 2021. A generic classification of the Thelypteridaceae. Sida, Bot. Misc. 59. BRIT Press, Fort Worth Botanic Garden, Botanical Research Institute of Texas, U.S.A. 102 pp.
  2. Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
  3. Plants of the World Online (POWO). 2025. Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Online. Available: https://powo.science.kew.org/ (accessed 2025).
  4. Pteridophyte Phylogeny Group I. 2016. A Community-Derived Classification for Extant Lycophytes and Ferns. Journal of Systematics and Evolution 54(6): 563–603.
  5. Valier, K. 1995. Ferns of Hawaii. University of Hawaii Press, Honolulu, HI.
  6. Weakley, A.S., and Southeastern Flora Team. 2025. Flora of the southeastern United States Web App. Edition of February 18, 2025. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. Online. Available: https://fsus.ncbg.unc.edu (accessed 2025).