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Scientific classification e
Kingdom: Plantae
Division: Pteridophyta
Class: Polypodiopsida/Pteridopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Hemidictyaceae
Christenh. & H. Schneider. 2011
Genus: Hemidictyum
C.Presl 1836
Species: H. marginatum
Binomial name
Hemidictyum marginatum
(L.) C.Presl

Hemidictyaceae is a family of ferns in the order Polypodiales.[1] Its sole genus is Hemidictyum C.Presl 1836, commonly known as the marginated half net fern.[2] Hemidictyaceae is considered to be a sister family to Aspleniaceae, believed to have diverged during the Cretaceous period.[3][4]

The name Hemidictyum was derived from the terms hemi (half) and diktyon (net), from the veins being netted only half-way across the pinnules.[5]


Hemidictyum is a native neotropical fern, found in Mexico, the Caribbean, Costa Rica, Guatemala, Honduras, Nicaragua, Panama, French Guiana, Suriname, Brazil, Venezuela, Puerto Rico, Bolivia, Colombia, Ecuador, and Peru.[2][6]


There is currently only one accepted Hemidictyum species name, Hemidictyum marginatum. The other names are considered to be synonyms, either of that species, or of accepted Asplenium species:[7]

  • Hemidictyum marginatum (L.) C.Presl 1836
(=) Asplenium marginatum L. 1753
(=) Asplenium limbatum Willd 1810 (nom. illeg superfl.)
(=) Diplazium marginatum Blume 1828
(=) Hemidictyum limbatum (Willd.) C.Presl 1851
(=) Diplazium marginatum (L.) Diels 1899 (nom. illeg)
(=) Diplazium limbatum (Willd.) Proctor 1966 (comb. superfl.)
  • Hemidictyum purdieanum (Hook.) T.Moore 1857
Asplenium purdieanum Hook 1854
  • Hemidictyum finlaysonianum (Wall. ex Hook) T.Moore 1857
Asplenium finlaysonianum Wall. ex Hook 1854

Phylogenic relationships[edit]

The following diagram for the eupolypods II, based on Lehtonen, 2011,[8] and Rothfels & al., 2012,[9] shows a likely phylogenic relationship between the Hemidictyaceae and the other families of the eupolypods II clade.

eupolypods II












  1. ^ Alan R. Smith; Kathleen M. Pryer; Eric Schuettpelz; Petra Korall; Harald Schneider; Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646. Archived from the original (PDF) on 2008-02-26. 
  2. ^ a b "Hemidictyum marginatum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 4 Feb 2012. 
  3. ^ Maarten J. M. Christenhusz; Xian-Chun Zhang; Harald Schneider (2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa. 19: 7–54. 
  4. ^ Maarten J. M. Christenhusz; Harald Schneider (2011). "Corrections to Phytotaxa 19: Linear sequence of lycophytes and ferns" (PDF). Phytotaxa. 28: 50–52. 
  5. ^ The Fern Manual, being a description of all the best stove, greenhouse and hardy ferns by contributors to the Journal of Horticulture p.69, London, 1863
  6. ^ Hemidictyum marginatum USDA-ARS Germplasm Resources Information Network (GRIN) 25 Jul 2002
  7. ^ Hemidictyum Tropicos.org. Missouri Botanical Garden. 04 Feb 2012
  8. ^ Samuli Lehtonen (2011). "Towards Resolving the Complete Fern Tree of Life" (PDF). PLoS ONE. 6 (10): e24851. PMC 3192703Freely accessible. PMID 22022365. doi:10.1371/journal.pone.0024851. 
  9. ^ Carl J. Rothfels; Anders Larsson; Li-Yaung Kuo; Petra Korall; Wen- Liang Chiou; Kathleen M. Pryer (2012). "Overcoming Deep Roots, Fast Rates, and Short Internodes to Resolve the Ancient Rapid Radiation of Eupolypod II Ferns". Systematic Biology. 61 (1): 70. PMID 22223449. doi:10.1093/sysbio/sys001.