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mangroves | Acrostichum in general
Piai lasu
Acrostichum speciosum

Family Pteridaceae

updated Jan 2013
Where seen? The more delicate and elegant of our mangrove ferns, it is often seen in back mangroves, flourishing on mud lobster mounds and other higher ground, usually in the shade. Compared to Piai raya (A. aureum), it is found in areas more frequently inundated by tides.

Features: The leaflets are thinner and shorter (1.5-2m long) than those of Piai raya (A. aureum) and young fronds are green or brownish-green. Rhizomes covered with scales up to 8mm long. The first few pairs near the tips are fertile leaflets, the underside covered below with dark brown spores (sporangia). Sterile leaflets gradually tapering to a narrow tip.

See the main page on mangrove ferns for their human uses.

Sungei Buloh Wetland Reserve, Mar 09

Young fronds are green.
Sungei Buloh Wetland Reserve, Mar 09

Sterile fronds have tapering pointed tips.
Sungei Buloh Wetland Reserve, Mar 09

Fertile fronds.
Admiralty Park, Mar 11

Piai lasu on Singapore shores

Photos of Piai lasu for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map



  • Tomlinson, P. B., 1986. The Botany of Mangroves Cambridge University Press. USA. 419 pp.
  • Burkill, I. H., 1993. A Dictionary of the Economic Products of the Malay Peninsula. 3rd printing. Publication Unit, Ministry of Agriculture, Malaysia, Kuala Lumpur. Volume 1: 1-1240; volume 2: 1241-2444.
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