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Seaweeds > Division Chlorophyta
Bubble green seaweed
Boergesenia forbesii*
Family Siphonocladaceae
updated Oct 2016

Where seen? These bright green bubbles are commonly seen on our Southern shores, growing on coral rubble in small scattered clusters.

Features: Clusters of elongated bubbles (3-4cm long and about 1cm wide) usually attached to hard surfaces. The bubbles are sometimes also pear-shaped. Bright green to yellowish green, the seaweed is smooth and shiny. The skin is thin so the entire bubble is translucent. Sometimes, 'empty' skins are seen.

According to AlgaeBase, there are 2 current species: Boergesenia forbesii and Boergesenia magna.

Sometimes confused with Green sea sausage seaweed (Bornetella sp.) which is more club- to cylindrical in shape and is opaque, and Beaded cushion green seaweed (Valonia sp.) which has tinier bubbles packed closely together. Here's more on how to tell apart some green seaweeds.

Pulau Jong, Jul 06

St. John's Island, Apr 12

St. John's Island, Apr 12

Labrador, Mar 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.

Bubble green seaweed on Singapore shores

Photos of Bubble green seaweed for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Kusu Island, Sep 10
Photo shared by Russel Low on facebook.

Pulau Salu, Aug 10

Terumbu Berkas, Jan 10

Boergesenia species recorded for Singapore
Pham, M. N., H. T. W. Tan, S. Mitrovic & H. H. T. Yeo, 2011. A Checklist of the Algae of Singapore.

  Boergesenia forbesii

Links References
  • 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].
  • A. C. Lee, Lawrence M. Liao and K. S. Tan. New records of marine algae on artificial structures and intertidal flats in coastal waters of Singapore. Pp. 5-40.
  • 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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