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Title: Lygodium  
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Subject: Vine, Fern, List of garden plants
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Lygodium japonicum
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Polypodiopsida /
 Pteridopsida (disputed)
Order: Schizaeales
Family: Lygodiaceae
Genus: Lygodium

See text

Lygodium (climbing fern) is a genus of about 40 species of ferns, native to tropical regions across the world, with a few temperate species in eastern Asia and eastern North America. It is the sole genus in the family Lygodiaceae, though included in the family Schizaeaceae by some botanists.

They are unusual in that the rachis, or midrib, of the frond is thin, flexible, and long, the frond unrolling with indeterminate growth and the rachis twining around supports, so that each frond forms a distinct vine. The fronds may be from 3-12 m long, depending on the species.

Some Lygodium species are now considered very problematic invasive weeds in the southeastern United States. Populations of Lygodium have increased more than 12-fold over the past decade, as noted by Florida's Institute of Food and Agricultural Sciences.[1]

Japanese climbing fern (Lygodium japonicum) was added to the Florida Noxious Weed List in 1999. It is also a major problem in pine plantations, causing contamination and harvesting problems for the pine straw industry. Old World climbing fern (Lygodium microphyllum) infests cypress swamps and other hydric sites, forming a monoculture. This massive infestation displaces all native flora and fauna, completely changing the ecosystem of the area.[2]

Plants in this genus have basal chromosome counts of n=28, 29, 30.


The aqueous ethanol extract of spores of Lygodium japonicum showed fatty acids oleic acid, linoleic acid and palmitic acid were identified as the main active principles inhibiting testosterone 5α-reductase.[3]

Selected species

References and External Links

  1. ^ "SS-AGR-21/AG122: Natural Area Weeds: Old World Climbing Fern (Lygodium microphyllum)". Retrieved 2014-07-15. 
  2. ^ "Japanese climbing fern—Lygodium japonicum | Center for Aquatic and Invasive Plants". Retrieved 2014-07-15. 
  3. ^ Matsuda H., Yamazaki M., Naruto S., Asanuma Y., Kubo M. (2002). "Anti-androgenic and hair growth promoting activities of Lygodii Spora (spore of Lygodium japonicum) I. Active constituents inhibiting testosterone 5α-reductase". Biological and Pharmaceutical Bulletin 25 (5): 622–626.  
  4. ^ "Flora of New Zealand | General Profile | Lygodium articulatum". Retrieved 2014-07-15. 
  • LygodiumFlora of North America:
  • "Lygodium Sw.".  
  • C.Michael Hogan. 2010. . Encyclopedia of Earth. eds. Saikat Basu and C.Cleveland. National Council for Science and the EnvironmentFern. Washington DC.
  • species listLygodiumFlora of China:
  • )Lygodium japonicumSpecies Profile- Japanese Climbing Fern (, National Invasive Species Information Center, United States National Agricultural Library. Lists general information and resources for Japanese Climbing Fern.
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