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Seaweeds > Division Chlorophyta > Family Ulvacea > Genus Ulva
Ribbon sea lettuce
Ulva reticulata*
Family Ulvaceae
updated Aug 10

Where seen? This bright green seaweed is commonly seen on our Northern shores. Seasonally abundant: at some times of the year, the shores may be blanketed in a thick layer of this seaweed.

Features: Flat strips, thin and translucent, glossy and smooth with many holes. Often crinkled into twists, the strips are narrow (1- 2cm wide) and may be 20cm or longer. There is a holdfast, usually embedded in the sand or some hard object in the sand. But during the seasonal bloom, free floating chunks of the seaweed can cover large areas of the shore. Usually bright green.

Sometimes confused with
Common sea lettuce (Ulva lactuca) which forms broad sheets.

Pulau Sekudu, Jun 04

Thin, long strips with many holes.
Pulau Sekudu, Jun 04

There is a holdfast embedded in the sand.
Chek Jawa, May 04

Changi, Apr 05

Ribbon sea lettuce on Singapore shores


Tuas, Jul 06

East Coast, Jun 06

Tanah Merah, Apr 05

more photos of ribbon sea lettuce on Singapore shores
northern shores | southern shores


*Species are difficult to positively identify without close examination of internal parts.
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