• Kingdom: Plantae
  • Phylum: Ochrophyta
  • Class: Phaeophyceae
  • Order: Desmarestiales 
  • Family: Desmarestiaceae
  • Scientific name: Desmarestia viridis
  • Norwegian: mykt kjerringhår


Typical for this delicate, light brown, seaweed is that the branching is always opposite. The main stipe and branches have a circular cross section. It may reach a height of 50-60 cm. When destroyed it releases sulfuric acid.


It is found on sand or rocky substrate in the low tidal or the subtidal zones, as deep as 20 meters.


It is found worldwide.