Weft fern
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Hymenophyllales
Family: Hymenophyllaceae
Genus: Crepidomanes
Species:
C. intricatum
Binomial name
Crepidomanes intricatum
(Farrar) Ebihara & Weakley[1]
Synonyms[1]
  • Trichomanes intricatum Farrar

Crepidomanes intricatum, synonym Trichomanes intricatum,[1] is known as the weft fern.[2] The genus Crepidomanes is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I),[3] but not by some other sources. As of October 2019, Plants of the World Online sank the genus into a broadly defined Trichomanes, treating this species as Trichomanes intricatum.[4]

This is an unusual filmy fern that grows in rock shelters and crevices in the eastern United States, with the southern extent in Georgia and extending north into New England.[5] It is known only from its filamentous gametophytes and completely lacks the sporophyte generation.[6] It is a rare plant that is protected in several US states.[6]

Recent study has found a relationship between this species and an Asian filmy-fern species, Crepidomanes schmidianum. Both share the same chloroplast genome, although the relationship between the two species is uncertain.[7] In 2011, Atsushi Ebihara and Alan S. Weakley transferred Trichomanes intricatum to Crepidomanes intricatum based on the chloroplast molecular sequence data.[8]

References

  1. 1 2 3 Hassler, Michael & Schmitt, Bernd (August 2019). "Crepidomanes intricatum". Checklist of Ferns and Lycophytes of the World. 8.10. Archived from the original on 2017-09-02. Retrieved 2019-10-08.
  2. ↑ USDA, NRCS (n.d.). "Trichomanes intricatum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 14 December 2015.
  3. ↑ PPG I (2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229. S2CID 39980610.
  4. ↑ "Trichomanes intricatum Farrar". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-10-08.
  5. ↑ Pinson et al. (2017). "The Separation of Generations: Biology and Biogeography of Long-Lived Sporophyteless Fern Gametophytes." International Journal of Plant Sciences 178(1):1-18.
  6. 1 2 Farrar, Donald R. (1992). "Trichomanes intricatum: The Independent Trichomanes Gametophyte in the Eastern United States." American Fern Journal, 82(2): 68-74.
  7. ↑ Ebihara, Atsushi, Donald R. Farrar, and Motomi Ito (2008). "The sporophyte-less filmy fern of eastern North America Trichomanes intricatum (Hymenophyllaceae) has the chloroplast genome of an Asian species." American Journal of Botany, 95: 1645-1651.
  8. ↑ Weakley et al. (2011). "Nomenclatural changes in the flora of the southeastern United States". Journal of the Botanical Research Institute of Texas 5(2): 443.


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