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Seaweeds > Division Rhodophyta
Tiny fern red seaweed
Bostrychia sp.*
Family Rhodomelaceae
updated Jan 13

Where seen? Mats of this tiny seaweed with tiny fern-like blades are sometimes seen on moist areas in our natural rocky shores, often among other tiny seaweeds. Elsewhere, it is commonly seen on the intertidal zone especially near mangroves and on mangrove roots, often forming thick bands in association with barnacles on the upper intertidal zone.

Features: Clusters of tiny feathery, fern-like blades (0.5-1cm), tightly packed together, forming a carpet on natural rocky shores at the high water mark. Colour brown, yellowish, reddish. Elsewhere may also be purplish. An astonishing variety of tiny creatures are often seen in thick carpets of this seaweed.

According to AlgaeBase: there are more than 150 species of Bostrychia.

Sentosa, Jul 11

Labrador, Dec 11

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

Tiny fern red seaweeds on Singapore shores

Photos of Tiny fern red seaweeds for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Bostrychia 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.

  Bostrychia calliptera
Bostrychia kelanensis
Bostrychia moritziana
Bostrychia radicans
Bostrychia simpliciuscula
Bostrychia tenella

With grateful thanks to Joseph Lai for identifying this seaweed.

  • 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.
  • 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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