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Seaweeds > Division Chlorophyta > Family Caulerpaceae > genus Caulerpa
Serrated green seaweed
Caulerpa serrulata*
Family Caulerpaceae
updated Oct 2016
Where seen? This coiled, serrated seaweed is sometimes seen on some of our shores, growing in small clumps on coral rubble.

Features: 4-6cm long, but often tightly coiled and thus shorter. The central 'stem' is strap-like, flat but thick. The 'stem' has serrated edges of blunt spikes. In some, the 'stem' is tightly coiled. These spiky strap-like structures emerge along the length of a horizontal 'stem' that creeps over hard surfaces or just under the sand. Usually bluish- or greyish-green.

Sometimes confused with similar green seaweeds. Here's more on how to tell apart some green seaweeds.

Human uses: This seaweed is reported to be edible and used in medicines as an antibacterial and antifungal agent as well as to lower blood pressure.

Labrador, May 09

Labrador, May 09

Sentosa, Jun 05

*Species are difficult to positively identify without close examination of internal parts. On this website, they are grouped by external features for convenience of display.
Serrated green seaweeds on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Berlayar Creek, Oct 15
Photo shared by Marcus Ng on facebook.

Terumbu Bemban, Jun 20
Photo shared by Kelvin Yong on facebook.

Pulau Hantu, Apr 21
Photo shared by Vincent Choo on facebook.

Terumbu Berkas, Jan 10

Pulau Biola, Dec 09

Pulau Salu, Aug 10

Pulau Senang, Aug 10

Pulau Senang, Jun 10



  • Lee Ai Chin, Iris U. Baula, Lilibeth N. Miranda and Sin Tsai Min ; editors: Sin Tsai Min and Wang Luan Keng, A photographic guide to the marine algae of Singapore, 2015. Tropical Marine Science Institute, 201 pp.
  • Pham, M. N., H. T. W. Tan, S. Mitrovic & H. H. T. Yeo, 2011. A Checklist of the Algae of Singapore, 2nd Edition. Lee Kong Chian Natural History Museum, National University of Singapore, Singapore. 99 pp. Uploaded 1 October 2011.
  • Eric Coppejans and Tom Beeckman. 1990. Caulerpa (Chlorophyta, Caulerpales) from the Kenyan coast (pdf). Laboratorium voor Morfologie, Systematiek en Ecologie van de Planten R.U.G. Ledeganckstraat 35, 9000 Gent, Belgium on the Phycology Research website: identification key and useful diagrams on how to tell apart similar Caulerpa species.
  • Lim, S., P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life and Times of Labrador Beach. Division of Biology, School of Science, Nanyang Technological University & Department of Zoology, the National University of Singapore. 160 pp.
  • Huisman, John M. 2000. Marine Plants of Australia University of Western Australia Press. 300pp.
  • Calumpong, H. P. & Menez, E. G., 1997.Field Guide to the Common Mangroves, Seagrasses and Algae of the Philippines. Bookmark, Inc., the Philippines. 197 pp.
  • Trono, Gavino. C. Jr., 1997. Field Guide and Atlas of the Seaweed Resources of the Philippines.. Bookmark, Inc., the Philippines. 306 pp.
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