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Seaweeds > Division Rhodophyta
Pimply red seaweed
Acrocystis nana*
Family Rhodomelaceae
updated Jan 13

Where seen? This tiny seaweed that looks like tiny brown pimples are sometimes seen on moist shady areas in our natural rocky shores, often among other seaweeds. Elsewhere, they are generally found on limestone rocks and near caves and shady areas.

Features: Tiny spherical or teardrop-shaped bumps (0.5-1cm). In clusters, often tightly packed together. These emerge from creeping rhizomes that cling to the hard surface. Although it appears brown it is a red seaweed

According to AlgaeBase: there is only one species of Acrocystis.

Sentosa, Jul 11

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

Pimply red seaweeds on Singapore shores

Photos of Pimply red seaweeds for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Acrocystis 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.

  Acrocystis nana

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].
  • 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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