green seaweeds text index | photo index
Seaweeds > Division Chlorophyta > Family Halimedaceae > Genus Halimeda
Small coin green seaweed
Halimeda sp.*
Family Halimedaceae
updated Jan 13
Where seen? This is seaweed made up of small, hard segments. It is commonly seen on many of our shores, usually growing on coral rubble or among living corals.

Features: An upright chain (3-5cm long) of joined up coin-like flattened segments. Each coin-like segment is hard as it is impregnated with calcium carbonate. Small coin green seaweeds have small segments about 1cm or less. In some, clusters of these chains are held up on a stalk that is buried. Colours range from light to bright green and olive green. Sometimes rather large 'thickets' may form, covering an area of 40-50cm.

In Halimeda opuntia, the joined-up segments are not held up on stalks. The segments tend to develop holdfasts where they contact with a hard surface so that the growth habit tends to be more horizontal than vertical.

Big coin green seaweeds have larger 'coins' that tend to be thinner and unwrinkled.

Human uses: Some species of Halimeda are used as fertilizers to recondition acidic soils. They are also used as animal feed and reportedly have anti-bacterial and anti-fungal properties.

St. John's Island, May 06

Small coin green seaweeds on Singapore shores

Sentosa, Jul 04

Sentosa, Jul 05

Pulau Semakau, Sep 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

Small coin green seaweeds on Singapore shores

Photos of Small coin green seaweeds for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Pulau Salu, Jun 10

Pulau Senang, Jun 10

Terumbu Berkas, Jan 10

Terumbu Selegie, Jun 11

Terumbu Pempang Darat, Jun 10

Berlayar Creek, Oct 15
Photo shared by Loh Kok Sheng on facebook.



  • 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. [PDF, 1.58 MB].
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