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Dipteris conjugata

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Dipteris conjugata
Dipteris conjugata in Taiwan
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Gleicheniales
Family: Dipteridaceae
Genus: Dipteris
Species:
D. conjugata
Binomial name
Dipteris conjugata
Synonyms[1]
  • Dipteris horsfieldii (R.Br. ex J.Sm.) Bedd.
  • Drynaria horsfieldii R.Br. ex J.Sm.
  • Phymatodes conjugata C.Presl
  • Polypodium conjugatum (Reinw.) Kaulf.
  • Polypodium dipteris Blume
  • Polypodium horsfieldii R.Br.

Dipteris conjugata is a species of fern in the family Dipteridaceae. It has a rhizome, and 2-3 tall stems with mid green or dark green fronds, which have several divisions to toothed lobes. It is grows in clearings, mountain ridges and in forest margins, from tropical and temperate Asia, northern Queensland in Australia and some islands in the Pacific Ocean. It has limited native medicinal uses.

Description

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It has a creeping rhizome covered with black shiny hairs or reddish brown hairlike scales.[2][3][4][5] The hairs are 4 to 5 mm long and 0.2 mm in diam.[6] The hairs are more like bristles on the older sections of the rhizomes.[4] It is up to 1 cm or more in diameter.[7]

The stipes (leaf stalks) are normally between 0.4–2.0 m (1 ft 4 in – 6 ft 7 in) long,[2][4] but stipes up to 2.5 m (8 ft 2 in) have also been found.[8] They have hair-like scales at base, which then becomes smooth and glabrous.[5][7] They are straw coloured to brown.[6]

The leaf stems appear at regular intervals along the rhizome.[4] and branch three or four times.[3] The rhizomes are usually terrestrial, but can also climb trees. The fronds are composed of two enormous leaflets, each up to 1 metre wide and broad.[9][10][11]

The fronds are mid green to dark green on the upper surface, and paler or glaucous underneath.[2][5][6] are between 0.5–0.7 m (1 ft 8 in – 2 ft 4 in) long and 0.5–0.7 m (1 ft 8 in – 2 ft 4 in) wide.[5][4][2] They are divided to the base into two fan-shaped halves, which are further divided more than halfway into 4 or more unequal lobes, which are again lobed one or more times. The ultimate lobes taper to a narrow apex with the edges deeply or coarsely toothed. The main veins branch into two veins several times.[7][5] The juvenile fronds are tomentose, i.e. with a layer of soft hairs.[2]

On the lower surface of the fronds are numerous small sori which are irregularly scattered and of irregular size and shape.[11][7][2][3][10][4] They do not have indusia (umbrella-like covers) and have paraphyses (filament-like support structures) which are club-shaped.[5][6]

Taxonomy

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Illustration of the fern from Die Farnkräuter der Erde in 1897

This species was described by Caspar Georg Carl Reinwardt in the book Sylloge Plantarum Novarum in 1828. He did not mention the origin of the specimen(s) that his description was based upon.[12]

Etymology

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The species epithet conjugata refers to the leaf having one pair of leaflets.[13][14]

Common names

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In Fiji it is known as koukoutangane,[3][2] or 'aivuiniveli'.[15] In Thailand it is called bua chaek[16] and bua cek in Singapore,[17] It is written as 双扇蕨[5] or 破傘蕨,[2] in Chinese script, and known as shuang shan jue in Pinyin in China.[5]

Biochemistry

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The leaves contain 2 ent-kauranoid hydroxy acids.[18][full citation needed]

Distribution and habitat

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Close-up of the leaf of the fern

It is native to tropical and temperate Asia, Australia and some Pacific islands.[16]

Range

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It can be found in temperate Asia, within the Ryukyu Islands of Japan. In tropical Asia, within Papua New Guinea, Cambodia (mainly Kampot[6]), Singapore,[4] Thailand, Vietnam,[16] and Hainan (in China), Taiwan, India, Indonesia, Malaysia (including on the slopes of Mount Ophir,[19]) and in the Philippines.[2][7][5] Also within Queensland in Australia,[20] and on the islands of New Caledonia,[16][7][2] (of New Zealand) and Fiji.[10]

Within Thailand, it is found in the provinces of Surat Thani, Phangnga, Nakhon Si Thammarat, Trang and Yala.[6] Within Singapore, it is found in the district of Kranji, Tanjung Gul and on the island of Pulau Tekong.[21]

Habitat

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D. conjugata grows on clay slopes,[6] in clearings,[17] ridges and on forest margins.[5][7] In East Kalimantan, Indonesia, it grows along rivers together with Nypa Palms.[7] In Borneo, it is found commonly growing with Histiopteris incisa (Thunb.) J. Sm. and Lygodium circinnatum (Burm.) Sw., along forest margins and paths.[22] In New Caledonia, it is found on sunny roadside banks.[10] The fern is also common in forest margins in high rainfall areas.[3]

The species occurs mainly at altitudes of 500 to 1,200 m (1,600 to 3,900 ft) above sea level in China,[5] 300 to 1,700 m (980 to 5,580 ft) in Malaysia,[4] and 300 to 2,900 m (980 to 9,510 ft) in Singapore.[7] In Singapore, it occurs on coastal cliffs,[17][2] and at the risk of landslides.[4][7] It is also

Conservation

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This species has a varying status in different countries. In Singapore it is classed as critically endangered, in Queensland it has been assessed as near threatened, while in Cambodia, Thailand and Laos it is seen as having no threats, such that it was recommended to the IUCN that it be classed as least concern.[6][23][24] As of August 2024, it has not been assessed by the IUCN.

Cultivation

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D.conjugata in Cibodas Botanical Garden, Indonesia

It is sometimes planted as an ornamental plant in Singapore.[17]

It can grown in poor to well drained soils and is mostly disease and pest resistant.[2]

Also specimens of the plant can be found in Cibodas Botanical Garden in West Java of Indonesia,[25] and in the Fernarium of Univerisiti Kebangsaan in Malaysia[26]

Uses

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It has been used as a medicinal plant to treat various ailments,[27] such as in southern Thailand, the roots have been collected for used in traditional medicine.[7][17][2] In Fiji, it is used to treat male reproductive ailments.[2]

It also has another use, in the highlands of Mindanao in the Philippines, the large fronds are used as an umbrella.[7]

References

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  1. ^ a b Hassler, Michael. "World Plants: Ferns and Lycophytes list". World Ferns. Synonymic Checklist and Distribution of Ferns and Lycophytes of the World. Retrieved 3 August 2024.
  2. ^ a b c d e f g h i j k l m n "Dipteris conjugata". Flora and Fauna Web. Singapore Government. Retrieved 29 December 2017.
  3. ^ a b c d e R.C. Cambie and J. Ash Fijian Medicinal Plants, p. 48, at Google Books
  4. ^ a b c d e f g h i Lok, A. F. S. L.; Ang, W. F.; Tan, H. T. W. (2009). "THE STATUS AND DISTRIBUTION IN SINGAPORE OF DIPTERIS CONJUGATA REINW. (DIPTERIDACEAE)". Nature in Singapore. 2: 339–345.
  5. ^ a b c d e f g h i j k "FOC Vol. 2-3 Page 116". efloras.org (Flora of China). Retrieved 29 December 2017.
  6. ^ a b c d e f g h "Dipteris conjugata". Ferns of Thailand, Laos and Cambodia. Royal Botanic Garden Edinburgh. Retrieved 30 September 2019.
  7. ^ a b c d e f g h i j k l Chia, Lee Kong. "Dipteris conjugata". lkcnhm.nus.edu.sg. Retrieved 30 September 2019.
  8. ^ Beddome, Col. R. H. (1892). Handbook of the Ferns of British India, Ceylon, and the Malay Peninsula. Calcutta: Thacker, Spink and Co. p. 336 plus engraving no. 185.
  9. ^ Beddome Handbook loc. cit.
  10. ^ a b c d Perrie, Leon (2 November 2012). "Ferns of New Caledonia that are very different to those in New Zealand". Te Papa’s Blog. Retrieved 5 October 2019.
  11. ^ a b F. O. Bower The Ferns (Filicales): Volume 2, The Eusporangiatae and Other Relatively Primitive Ferns, Volume 2, p. 315, at Google Books
  12. ^ Reinwardt, Caspar Georg Carl (1828). Hornschuch, Christian Friedrich (ed.). Sylloge Plantarum Novarum. Vol. 2. Regensburg: C. E. Brenck. p. 3. Retrieved 3 August 2024.
  13. ^ "conjugate". The Free Dictionary. Retrieved 5 October 2019.
  14. ^ Abraham Rees The Cyclopædia; Or, Universal Dictionary of Arts, Sciences, and Literature, Volume 20 (1819), p. 285, at Google Books
  15. ^ Parham, H. B. Richenda. "Fiji Plants Their Names and Uses". Retrieved 20 October 2019.
  16. ^ a b c d "Dipteris conjugata". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 2 October 2019.
  17. ^ a b c d e Yeo, Ron (15 July 2012). "Coastal Epiphytes, Ferns & Ground-dwelling Herbs of Singapore". tidechaser. Retrieved 30 September 2019.
  18. ^ N. Tanaka 'Chemical and Pharmaceutical Bulletin (Japan), 1985, 33 page 152
  19. ^ A. C. Seward Darwin and Modern Science: the Evolution, p. 133, at Google Books
  20. ^ "Native plants of Malaan National Park". wetlandinfo.des.qld.gov.au. Queensland Government. Retrieved 20 October 2019.
  21. ^ Ibrahim, Hassan. "Saving A Prehistoric Fern From Extinction". nparks.gov.sg. Retrieved 30 September 2019.
  22. ^ Cicuzza, Daniele (20 December 2014). "A rediscovery of Alfred Russel Wallace's fern collection from Borneo at the Cambridge University Herbarium". Notes and Records: The Royal Society Journal of the History of Science. 68 (4): 403–412. doi:10.1098/rsnr.2014.0035. PMC 4213437.
  23. ^ "Flora - Species List (Red Data Book List)". National Parks. National Parks Board, Singapore. Retrieved 4 August 2024.
  24. ^ "Species profile—Dipteris conjugata". Queensland Department of Environment and Science. Queensland Government. 2024. Retrieved 4 August 2024.
  25. ^ Bell, P. R. (May 1986). "Features of Egg Cells of Living Representatives of Ancient Families of Ferns". Annals of Botany. 57 (5): 613–621. doi:10.1093/oxfordjournals.aob.a087144.
  26. ^ V. H. Heywood and Peter Wyse Jackson (editors) Tropical Botanic Gardens: Their Role in Conservation and Development, p. 234, at Google Books
  27. ^ H.B.R. Parham, 'Fiji native plants with their medicinal and other uses' Polynes. Soc. Mem 16 The Polynesian Society, page 160

Other sources

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  • de Winter, W. P. & V. B. Amoroso (eds.), 2003. Plant resources of South-East Asia No. 15(2). Cryptogams: Ferns and fern allies. Prosea Foundation, Borgor, Indonesia. 268 pp.
  • Hnatiuk, R. J., 1990. Census of Australian vascular plants. Australian Flora and Fauna Series No. 11.
  • Holttum, R. E., 1954. Plant life in Malaya. Longmans, Green & Co.. London. 254 pp.
  • Holttum, R. E., 1966. A revised flora of Malaya. II Ferns of Malaya. Govt. Printing Office, Singapore (2nd ed.). 653 pp.
  • Lim, S., P. Ng, L. Tan & Y. C. Wee, 1994. Rhythm of the sea - The life and times of Labrador beach. School of Science, National Technological University & Department of Botany, National University of Singapore.
  • Parris, B. S., R. Khew, R. C. K. Chung, L. G. Saw & E. Soepadmo (eds.), 2010. Flora of Peninsular Malaysia. Series I: Ferns and Lycophytes. Vol. 1. Malayan Forest records No. 48. Forest Research Institute of Malaysia, Kepong. 249 pp.
  • Smitinand, T. & K. Larsen, eds. 1970-. Flora of Thailand.
  • Wee, Y. C., 2005. Ferns of the tropics. Times Editions-Marshall Cavendish, Singapore. 2nd ed. 190 pp.
  • Wee, Y. C. & R. Hale, 2008. The Nature Society (Singapore) and the struggle to conserve Singapore's nature areas. Nature in Singapore 1: 41-49.
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Media related to Dipteris conjugata at Wikimedia Commons

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