Dipteris conjugata

Dipteris conjugata is a species of fern. 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, Australia and some islands in the Pacific Ocean. It has limited native medicinal uses.

Dipteris conjugata
Dipteris conjugata in Taiwan
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Gleicheniales
Family: Dipteridaceae
Genus: Dipteris
Species:
D. conjugata
Binomial name
Dipteris conjugata
Synonyms

Phymatodes conjugata (Reinwardt) C. Presl.[1]
Polypodium horsfieldii R.Br. in Benn.
Dipteris horsfieldii (R.Br.) Bedd.[2]

Description

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

It has Stipes (or stalks) that are between 0.4–2.0 m (1 ft 4 in–6 ft 7 in) tall,[3][5] which have hairlike scales at base, and then becomes smooth and glabrous.[1][6] They are stramineous (straw coloured) to brown.[2]

The leaf stems appear at regular intervals along the rhizome.[5] and branch three or four times,[4] with 1 metre wide fronds,[7] or lamina (leaf blades).[8]

The mid green,[3] or dark green fronds,[1] but paler or glaucous underneath.[2] 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.[1][5][3] They are divided to the base into two spreading fan-shaped halves, which are further divided more than halfway into 4 or more unequal lobes, these lobes are again less deeply lobed once or more times. The ultimate lobes taper to a narrow apex with the edges deeply or coarsely toothed. The main veins are dichotomously branched several times.[6][1] The veins on the fronds are also dichotomously-branched with 2–4 main veins entering each of the lobes.[5][2] The juvenile fronds are tomentose (with a layer of downy hairs).[3]

On the lower surface of the fronds, are numerous,[8] small sori (spore producers),[4][7][5] they are irregularly scattered and of irregular size and shape.[6][3] They do not have indusia (umbrella-like covers) and have paraphyses (filament-like support structures) which are club-shaped.[1][2]

Biochemistry

The leaves contain 2 ent-kauranoid hydroxy acids.[9]

Taxonomy
Illustration of the fern from Die Farnkräuter der Erde in 1897

In Fijian, it is known as koukoutangane,[4][3] or 'aivuiniveli'.[10] In Thailand it is called bua chaek[11] and bua cek in Singapore,[12]

It is written as 双扇蕨[1] or 破傘蕨,[3] in Chinese script, and known as shuang shan jue in Pidgin in China.[1]

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

It was described by Caspar Georg Carl Reinwardt in Syll. Pl. Nov. 2: 3 in 1828.[1][15]

Dipteris conjugata was also published by Tardieu & C.Chr., Fl. Indo-Chine 7(2): 442. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 135, f. 55. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 46. 1967; Acta Phytbtax. Geobot. 23: 52. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 481, f. 49.1 & 49.2. 1989; Boonkerd & Pollawatn and Pterid. Thailand: 32, 78. 2000.[2]

Distribution and habitat
Close-up of the leaf of the fern

It is native to tropical and temperate Asia, Australia and some islands in the Pacific Ocean.[11]

Range

It can be found in temperate Asia, within the Ryukyu Islands of Japan. In tropical Asia, within Papua New Guinea, Cambodia (mainly Kampot[2]), Singapore,[5][16] Thailand, Vietnam,[11] and Hainan (in China), Taiwan, India, Indonesia, Malaysia (including on the slopes of Mount Ophir,[17]) and in the Philippines.[3][6][1] Also within Queensland in Australia,[18] and on the islands of New Caledonia,[11][6][3] (of New Zealand) and Fiji.[7]

Within Thailand, it is found in the provinces of Surat Thani, Phangnga, Nakhon Si Thammarat, Trang and Yala.[2] Within Singapore, it is found in the district of Kranji, Tanjung Gul and on the island of Pulau Tekong.[19]

Habitat

D. conjugata grows on clay slopes,[2] in clearings,[12] ridges and on forest margins.[1][6] In East Kalimantan, Indonesia, it grows along rivers together with Nypa Palms.[6] In Borneo, it is found commonly growing with Histiopteris incisa (Thunb.) J. Sm. and Lygodium circinnatum (Burm.) Sw., along forest margins and paths.[20] In New Caledonia, it is found on sunny roadside banks.[7] The fern is also common in forest margins in high rainfall areas.[4]

The species occurs mainly at altitudes of 500 to 1,200 m (1,600 to 3,900 ft) above sea level in China,[1] 300 to 1,700 m (980 to 5,580 ft) in Malaysia,[5] and 300 to 2,900 m (980 to 9,510 ft) in Singapore.[6] In Singapore, it occurs on coastal cliffs,[12][3] and at the risk of landslides.[5][6] It is also

Conservation

Dipteris conjugata is listed as Critically Endangered,[12] in the 2008 Singapore Red Data Book.[5][6][19] In Labrador Nature Reserve in Singapore, a large historic fern population was decimated,[19] when the reserve was downgraded to a nature park to only a few plants left in 2001.[6][3] It has also been found in Tanjong Berlayar Park in Singapore.[16][21]

To help conserve this fern, staff from the National Biodiversity Centre regularly check on the growth of the Dipteris in the Western Water Catchment. Using parangs and secateurs, they prune and clear the plants that may damage the fern, such as the invasive weed, Simpuh Air (Dillenia suffruticosa), the Weeping Fig (Ficus benjamina), and the Resam (fern) (Dicranopteris linearis).[19]

Elsewhere in other areas, at has been assessed as Least Concern (LC), as this species is widespread and not under any known threat.[2]

Cultivation
D.conjugata in Cibodas Botanical Garden, Indonesia

It is sometimes planted as an ornamental plant in Singapore.[12]

It can grown in poor to well drained soils and is mostly disease and pest resistant.[3]

Also specimens of the plant can be found in Cibodas Botanical Garden in West Java of Indonesia,[22] and in the Fernarium of Univerisiti Kebangsaan in Malaysia[23]

Uses

It has been used as a medicinal plant to treat various ailments,[24] such as in southern Thailand, the roots have been collected for used in traditional medicine.[6][12][3] In Fiji, it is used to treat male reproductive ailments.[3]

It also has another use, in the highlands of Mindanao in the Philippines, the large fronds are used as an umbrella.[6]

References
  1. "FOC Vol. 2-3 Page 116". efloras.org (Flora of China). Retrieved 29 December 2017.
  2. "Ferns of Thailand, Laos and Cambodia > Dipteris conjugata". rbg-web2.rbge.org.uk. Royal Botanic Garden Edinburgh. Retrieved 30 September 2019.
  3. "Dipteris conjugata". florafaunaweb.nparks.gov.sg. Retrieved 29 December 2017.
  4. R.C. Cambie and J. Ash Fijian Medicinal Plants, p. 48, at Google Books
  5. 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.
  6. Chia, Lee Kong. "Dipteris conjugata". lkcnhm.nus.edu.sg. Retrieved 30 September 2019.
  7. 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.
  8. F. O. Bower The Ferns (Filicales): Volume 2, The Eusporangiatae and Other Relatively Primitive Ferns, Volume 2, p. 315, at Google Books
  9. N. Tanaka 'Chemical and Pharmaceutical Bulletin (Japan), 1985, 33 page 152
  10. RICHENDA PARHAM, H. B. "FIJI PLANTS THEIR NAMES AND USES". Retrieved 20 October 2019.
  11. "Dipteris conjugata". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2 October 2019.
  12. Yeo, Ron (15 July 2012). "Coastal Epiphytes, Ferns & Ground-dwelling Herbs of Singapore". tidechaser. Retrieved 30 September 2019.
  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. "Dipteris conjugata". Tropicos. Missouri Botanical Gardens. Retrieved 29 December 2017 – via The Plant List.
  16. Raffaella Sini Singapore’s Park System Master Planning: A Nation Building Tool to Construct Narratives in Post-Colonial Countries, p. 321, at Google Books
  17. A. C. Seward Darwin and Modern Science: the Evolution, p. 133, at Google Books
  18. "Native plants of Malaan National Park". wetlandinfo.des.qld.gov.au. Queensland Government. Retrieved 20 October 2019.
  19. Ibrahim, Hassan. "Saving A Prehistoric Fern From Extinction". nparks.gov.sg. Retrieved 30 September 2019.
  20. 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.
  21. Peter K. L. Ng, Richard Corlett and Hugh T. W. Tan (editors) Singapore Biodiversity: An Encyclopedia of the Natural Environment and ... , p. 310, at Google Books
  22. 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.
  23. V. H. Heywood and Peter Wyse Jackson (editors) Tropical Botanic Gardens: Their Role in Conservation and Development, p. 234, at Google Books
  24. H.B.R. Parham, 'Fiji native plants with their medicinal and other uses' Polynes. Soc. Mem 16 The Polynesian Society, page 160

Other sources
  • 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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