Halophila decipiens   Ostenfeld,  1902 (Seagrass)
Organism information awaits expert curation
Taxonomy
Kingdom:Plantae
Phylum:Magnoliophyta
Class: Equisetopsida
Order:Alismatales
Family:Hydrocharitaceae

Image copyrights: D. and M. Littler

Description
Plants monoecious, delicate, small, in leafy patches. Leaves with central vein of rectangular cells; margin veins splitting from central vein at leaf base; Rhizomes creeping, branched, slender, fragile, and translucent. Roots solitary, unbranched. Internodes 1.5-3.5 cm by 0.5-1 mm. Scales 2, obovate, amplexicaul to subtruncate at base, incised or mucronate at apex, keeled, entire or serrulate along margins and midribs. Shoots branched or unbranched, with 2 leaves at each node. Petioles faintly triquetrous, up to 10 mm long, hyaline. Lamina oblong-elliptic, cuneate at base, obtuse to acute at apex, serrulate along margins, hairy on both surfaces. Spathes ovate, acuminate to mucronate at apex, entire or serrulate along margins, with or without stiff hairs abaxially, keeled, scarious, hyaline, enclosing 1 male and 1 female flower, splitting at the top when fruits mature.
Male flowers occur at the base of the subsessile female flowers, pale green. Pedicels upto 3 mm long, slender. Tepals 3, ovate to elliptic, subtruncate at base, obtuse to hooded at apex, entire along margins, concave, hyaline. Anthers 3, linear-oblong, only connective tissue remains after anthesis, brown. Pollen grains ellipsoid, adhere to the dorsal side of the tepals. Female flowers subsessile, upto 6 mm long. Ovary oblongoid to ovoid. Hypanthium 1-2 mm long, erect, crowned by 3 reduced tepals. Styles 3, radiating, papillose adaxially, smooth abaxially.
Fruits globose, with persistent hypanthium. Pericarp translucent, scarious. Seeds globose, bluntly beaked at both ends, about 26 in number. Testa reticulate, pale white. Flowering and fruiting from January to March.


Synonym (s)

Common Name (s)
• Kadal Paasi (Tamil)
• Neer Pasalai (Tamil)
Economic Importance and Threats

Ecology
Habitat:  Sandy, Muddy, Coastal

Biogeography


• Tamil Nadu, Tuticorin, Thirespuram INDIA (Record: 22/01/1987) (Depth: ±2 mts)
• Tamil Nadu, Tuticorin Harbour INDIA (Record: 30/04/1988) (Depth: ±5 mts)
• Tamil Nadu INDIA
• Tamil Nadu, Pamban INDIA
• Tamil Nadu, Manoli Island INDIA
• Tamil Nadu, Gulf of Mannar, Hare Island INDIA
• Tamil Nadu, Tuticorin INDIA
• Maharashtra INDIA

Literature Source(s)
  • Ramamurthy, K; Balakrishnan, NP; Ravikumar, K and Ganesan, R (1992) Seagrasses of Coromandel Coast India Botanical Survey of India, Coimbatore 80 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Smithsonian Marine Station at Fort Pierce Available at - http://www.sms.si.edu/
  • Jagtap, TG; Komarpant, DS and Rodrigues, R (2003) The seagrasses of India World atlas of seagrasses University of California Press, Berkeley, USA 101-108 Available at - NIO, Goa
  • (2006) Algaebase Available at - http://www.algaebase.org/
  • Thangaradjou, T and Kannan, L (2005) Marine sediment texture and distribution of seagrasses in the Gulf of Mannar Biosphere Reserve Seaweed Res Utilis NISCAIR 27(1&2) 145 - 154 Available at - http://www.casmbenvis.nic.in/sdnp/coral%20reef%20pdf/C11.pdf
  • Tanaji,G; Jagtap, Deepali,S; Komarpant, and Rodrigues, RS (2003) Status of a seagrass ecosystem:an ecologically sensitive wetland habitat from India Wetlands 23(1) 161–170 Available at - http://www.springerlink.com/content/awjp1469442q5g75/fulltext.pdf
  • Jagtap, TG (1991) Distribution of seagrasses along the Indian coast Aquatic Botany Elsevier B.V. 40(1) 379-386 Available at - NIO, Goa
  • Littler, DS; Littler, MM and Brooks, BL (1995) Marine algae and seagrasses from the Tobacco Range Fracture Zone, Belize, C.A Atoll Research Bulletin Smithsonian Institution Press 429 1-43 Available at - http://si-pddr.si.edu/dspace/handle/10088/2580

Page last updated on:2011-10-04

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