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Scientific classification edit
Kingdom: Plantae
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Hemidictyaceae
Christenh. & H. Schneider. 2011
Genus: Hemidictyum
C.Presl 1836
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]

Phylogenetic relationships[edit]

The following cladogram for the suborder Aspleniineae (as eupolypods II), based on Lehtonen (2011),[6] and Rothfels & al. (2012),[7] shows a likely phylogenetic relationship between the Hemidictyaceae and the other families of the clade.

Aspleniineae (eupolypods II)












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:[8]

  • 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


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][9]


  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. Cite uses deprecated parameter |deadurl= (help)
  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. ^ Samuli Lehtonen (2011). "Towards Resolving the Complete Fern Tree of Life" (PDF). PLoS ONE. 6 (10): e24851. doi:10.1371/journal.pone.0024851. PMC 3192703. PMID 22022365.
  7. ^ 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. doi:10.1093/sysbio/sys001. PMID 22223449.
  8. ^ Hemidictyum Tropicos.org. Missouri Botanical Garden. 04 Feb 2012
  9. ^ "Hemidictyum marginatum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 12 January 2018.