Colony of individual polyps (hydranths) joined by root-like network of tubular stolons at the base. Colony shape is tree-like or bushy (arborescent). Colour: colony and corbulae pale grey, gonophores white to cream. Up to 5 cm high.
This is one of the most spectacular and graceful hydroids in southern Australia. The often form dense colonies on sponges and ascidians. Their colonies grow and become fertile in autumn to winter.
On sponges and compound ascidians, in sheltered waters.
New Zealand and southern Australia.
Plankton or Particles
Generally not harmful but still able to sting bare skin.
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed