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Dieren en planten

Water en land

Mens en Milieu



5 - 100 centimeters long


long thin hollow ribbons

  • Dut: Echt darmwier
  • Lat: Enteromorpha intestinalis, Ulva intestinalis
  • Eng: Gutweed, grass kelp
  • Ger: Darmtang
  • Dan: Tarmrĝrhinde
Gutweed, Ecomare


Take a close look at the long strands of this seaweed, then there is no doubt where it got its name from: long, thin, inflated tubes. Its appearance can vary depending upon where it grows. There are lots of species of gutweed, often growing at the foot of a sea dike, on tidal flats and beaches. Some even grow in fresh water. You can find around ten different species in the Netherlands, which are only possible to identify with the help of a microscope.

On Texel

, Sytske Dijksen,

The tidal flats by De Cocksdorp can be covered with gutweed in the summer. The sea currents tend to roll the seaweed into thick bundles, which are often mistaken for seals lying in the distance. Many bottom-dwelling animals, such as crabs, get caught under these bundles and suffocate due to a lack of air.