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green seaweeds text index | photo
index
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| Seaweeds > Division Chlorophyta > Family Ulvacea > Genus Ulva |
| Common
sea lettuce Ulva lactuca* Family Ulvaceae updated Aug 10 Where seen? Often mistaken for green plastic bags, this flat sheet seaweed is commonly seen on our Northern shores, growing on rocks and coral rubble. Features: Sheets that are flat, thin and translucent, glossy and smooth. Usually entire without many holes. The edges are sometimes ruffled. Can grow to 10cm wide or more. Usually bright green. There is a holdfast, usually embedded in the sand or attached to a hard surface. During a 'bloom', free floating sheets can blanket a large stretch of the shore. Usually bright green, sometimes with a yellowish tint. Sometimes confused with Ribbon sea lettuce (Ulva reticulata) which looks like a shredded version of the Common sea lettuce. |
 Labrador, Mar 05 |
 Tiny tuft growing on a rock. Labrador, Aug 04 |
 Transparent blade: reproducing? Labrador, May 05 |
 With ribbon sea lettuce. East Coast, Jun 06 |
Common sea lettuce on Singapore shores
 Tanah Merah, Apr 05  |
 Pulau Sekudu, Jun 05  |
 Changi, Apr 05  |
more
photos of common sea lettuce on Singapore shores
*Species are difficult to positively identify without close examination of internal parts.
On this website, they are grouped by external features for convenience of display.
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