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Seaweeds > Division Rhodophyta
Scaly red seaweed
Peyssonnelia sp.*
Family Peyssonneliaceae
updated Jan 13

Where seen? On the intertidal, this flat hard circular seaweed encrusts hard surfaces near reefs, often overlapping like fish scales.

Features: Clusters of flat circular encrusting (2-4cm) disks that have a slippery surface. The disks are hard because they incorporate calcium carbonate on the underside. Most of the disk is stuck to a hard surface, sometimes the edges are free. Often crowded or overlapping. Colour orangey, yellowish brown, chocolate brown to brown.

Sometimes confused with Bracket brown seaweed (Lobophora variegata) which is not so encrusting and is leathery.

According to AlgaeBase: there are 72 species of Peyssonnelia many of them requiring microscopic examination to determine to species.

Tanah Merah, Dec 09

Labrador, May 06
*Seaweed species are difficult to positively identify without microscopic examination.
On this website, they are grouped by external features for convenience of display.

Scaly red seaweeds on Singapore shores

Photos of Scaly red seaweeds for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

East Coast, Aug 09

Tanah Merah, Dec 09

Sisters Island, Jan 07

Cyrene Reef, Nov 08

Lazarus Island, Dec 06

St. John's Island, Mar 07

Peyssonnelia 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.


Peyssonnelia inamoena
Peyssonnelia rubra

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].
  • Huisman, John M. 2000. Marine Plants of Australia University of Western Australia Press. 300pp.
  • 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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