brown seaweeds text index | photo index
Seaweeds > Division Phaeophyta > Genus Dictyota
Bluish y-branch brown seaweed
Dictyota dichotoma*
Family Dictyotaceae
updated Feb 13

Where seen? Forming a clump of blue-tinged y-shaped blades, this seaweed is sometimes seen on our Southern shores, on coral rubble.

Features: Flat, strap-like structures about 0.5-1cm wide and 5-7cm long. Regular branching on the same plane, forming distinct y-shapes with roundedtips. It has no 'veins' down the middle of the blade.
The outer edges of the blade has a pattern of fine bars that form alternating blocks of dark and light blue sometimes forming a 'chequered' pattern on the rest of the blade as well. Generally light brown, sometimes maroon with a bluish tinge. Entire seaweed often forms an overall ball-shape.

Human uses: Strap brown seaweed is eaten by people and used as animal feed, medicine for its antibacterial properties. D. dichotoma is also used to make beer, frozen food, fruit juices, ice cream, jellies, in meat and flavour sauces, milk shakes, pastries and salad dressings. Extracts from it are also used in industry as emulsifiers, gelling agents, stabilisers.

Pulau Tekukor, Oct 10

Labrador, Jan 06

Sentosa, Jan 06

Sentosa, Oct 04

Lazarus Island, Feb 11

*Seaweed species are difficult to positively identify without microscopic examination.
On this website, they are grouped by external features for convenience of display.

Bluish y-branch brown seaweed on Singapore shores

Photos of Bluish y-branch brown seaweed for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Pulau Biola, Dec 09



  • 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].
  • 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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