Gracilaria debilis   (Forskaal) Borgesen,  1932 (Algae)
Organism information awaits expert curation
Class: Florideophyceae

Color: Pale straw colored to pinkish in living state, dull grayish brown when drying

Thallus form and type: Bushy and succulent

Substratum: Intertidal rocks and calcareous substrata

Occurrence: Upper mid littoral zone, tide pools

Season: December-April

Abundance: Scanty

Plants usually bushy, coarse, reaching a height of 2 dm and becoming horny. Abundantly branched, the lower branching irregularly alternate, the subterete segments to 3-6 mm diameter, cervicorn above, the ultimate segments varying from short and acute to flagelliform. In section showing a medulla of large, thick walled cells, 240-320 µ diameter, which gradually grade into the smaller-celled sub-cortex. Surface cells about 5.4-7.5 µ diameter, rounded or oval. Cystocarps prominent.

Synonym (s)
Ceramianthemum obtusum (Kutzing) Kuntze, 1891
(Heterotypic synonym)
Fucus debilis Forsskal, 1775
(Homotypic synonym)
Gigartina obtusa Greville ex J. Agardh, 1852
(Heterotypic synonym)
Gracilaria fergusonii J. Agardh, 1901
(Heterotypic synonym)
Gracilaria fergusonii Silva et al., 1996
Gracilaria obtusa (Greville ex J. Agardh) Harvey, 1857
(Heterotypic synonym)
Gracilaria obtusa Silva et al., 1996
Gymnogongrus javanicus Sonder, 1854
(Heterotypic synonym)
Polycavernosa debilis (Forsskal) Fredericq & J. Norris, 1985
(Homotypic synonym)
Sphaerococcus obtusus Kutzing, 1869
(Heterotypic synonym)

Common Name (s)
Economic Importance and Threats

Habitat:  Coastal


• Tamil Nadu, Tuticorin (Lat: 8.78) (Long: 78.13) INDIA
• Tamil Nadu, Krusadai Island (Lat: 9.23) (Long: 79.22) INDIA
• Tamil Nadu INDIA
• Tamil Nadu, Pamban (Lat: 9.29) (Long: 79.21) INDIA
• Tamil Nadu, Gulf of Mannar (Lat: 8.5) (Long: 79) INDIA
• Gujarat, Saurashtra (Lat: 21.97) (Long: 70.5) INDIA
• Tamil Nadu, Tiruchendur (Lat: 8.48) (Long: 78.12) INDIA
• Gujarat INDIA
• Kerala INDIA
• Andaman and Nicobar Islands, Nicobar Island (Lat: 7.24) (Long: 93.74) INDIA
• Andaman and Nicobar Islands, Nicobar Islands INDIA
• Gujarat, Veraval INDIA

Literature Source(s)
  • Krishnamurthy, V and Rajendran, NR (1986) Post fertilization development in Gracilaria Greville Seaweed Research and Utilization Seaweed Research and Utilization Association, Marine Fisheries-623 520, Tamil Nadu, India 9(1-2) 93-96 Available at - NIO, Goa
  • Sahoo, D; Nivedita and Debasish (2001) Seaweeds of Indian coast S. B. Nangia, A. P. H. Publishing Corporation, New Delhi 283 pp Available at - NIO, Goa
  • Bolton, JJ; Oyieke, HA and Gwada, P (2007) The seaweeds of Kenya: Checklist, history of seaweed study, coastal environment, and analysis of seaweed diversity and biogeography South African Journal of Botany 73 76-88 Available at - NCL, Pune
  • Schils, T and Eric, C (2003) Spatial variation in subtidal plant communities around the Socotra Archipelago and their biogeographic affinities within the Indian Ocean Marine Ecology Progress Series 251 103-114 Available at - NCL, Pune
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Krishnamurthy, V and Rajendran, NR (1987) Gonimonema, a structural feature of Gracilaria Seaweed Research and Utilization 10(1) 40071 Available at - NIO, Goa
  • Taylor, WR (1972) Marine algae of the eastern tropical and subtropical coasts of the Americas University of Michigan Press 870 pp Available at - NIO, Goa
  • Jha B, Reddy C.R.K, Thakur M C and Rao M (2009) Seaweeds of India The Diversity and Distribution of seaweeds of Gujarat Coast Springer 211pp Available at - NIO

Page last updated on:2012-12-10

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