Laurencia elata   (C. Agardh) J. Hooker & Harvey  (Algae)
Organism information awaits expert curation
Taxonomy
Kingdom:Plantae
Phylum:Rhodophyta
Class: Florideophyceae
Order:Ceramiales
Family:Rhodomelaceae

Image copyrights: John Huisman

Description
Size: 5-12 cm length

Color: Purplish green

Thallus erect, soft and fleshy and grows in tufts of about 6-8 thalli, attached to the substratum by primary discoid holdfast and creeping stolon-like prostrate branches approximately 0.50-0.75 mm in diameter. Branching is alternate - opposite. The main axes are terete 0.75-1.00 mm in diameter, becoming gradually more slender upward and reach 0.25-0.50 mm in diameter near the apices. Many first order branches develop from the main axis in various ways, from alternate to sub opposite at irregular intervals, at angles of 30-40˚ with a length of 6-10 cm and a diameter of 0.50-0.75 mm. First order branches bear progressively shorter and more slender branches upto the 5th order. The ultimate branchlets are 0.5-1.5 mm in length and 0.2-0.5 mm in diameter. Many short adventitious branches develop between these ordinary branches with a length of 0.1-2.0 mm.

Trichoblast filaments are short and clustered at the notched apex of the ultimate branchlets. The cortical cells of the main axes are regularly arranged in many longitudinal rows in surface view, elongated longitudinally, 110-145 µm long and 56-80 µm wide, while those of the basal and upper portions become more irregular in arrangement due to further development of the cortical cells. Secondary pit connections are found between the adjacent superficial cells. "Corps en cerise" are absent. The size of the medullary cells gradually increase from the periphery to the centre. The cells of the medulla are spherical to oval in shape. The largest has a diameter of about 33-39.6 µm. Some of the central medullary cells are provided with annular thickening.

Tetrasporangia are formed in acropetal succession on the first to fifth order branches and adventitious branches. The tetrasporangial branches are 0.5-2.0 mm long and 400-650 µm wide. Tetrasporangia are spherical with a diameter of 105-115.5 µm parallely arranged.


Synonym (s)
Chondria pinnatifida var. elata C. Agardh, 1822
(Homotypic synonym)
Laurencia pinnatifida var. elata (C. Agardh) Sonder, 1846
(Homotypic synonym)
Laurencia elata var. luxurians Harvey, 1863
(Heterotypic synonym)
Laurencia luxurians (Harvey) J. Agardh, 1876
(Heterotypic synonym)
Laurencia elata f. luxurians (Harvey) Yamada, 1931
(Heterotypic synonym)

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Estuarine, Coastal

Biogeography


• Tamil Nadu, Pamban (Lat: 9.29) (Long: 79.21) INDIA
• Lakshadweep, Kalpeni INDIA (Record: 03/04/1994)

Literature Source(s)
  • Rao, DVS (2005) Comprehensive review of the records of the biota of the Indian Seas and the introduction of non-indigenous species Aquatic Conservation: Marine and Freshwater Ecosystems John Wiley and Sons, Ltd. 15(2) 117-146 Available at - http://dx.doi.org/10.1002/aqc.659
  • (2006) Algaebase Available at - http://www.algaebase.org/
  • Jaasund, E (1970) Marine algae in Tanzania II Botanica marina Cram,De Gruyter and Co. Hamburg, Germany 13 59-64 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
  • Panikkar, MVN; Sindhu, P and Ampili, P (1998) On the occurrence of Laurencia elata (C. Ag.) J. Hooker & Harvey (Ceramiales, Rhodophyta) from Lakshadweep Seaweed Research and Utilisation Seaweed Research and Utilisation Association, Tamil Nadu, India 20(1&2) 103-106 Available at - NIO, Goa

Page last updated on:2010-06-28

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