General Description

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 (basket-like structure containing reproductive structures) pale grey, gonophores (reproductive structures) white to cream. Up to 5 cm high.

Biology

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.

Distribution

Nw Zealand. Southern Australia.

Habitat

Subtidal in sheltered waters, epiphytic on seagrasses and algae; epizoic on bryozoans, ascidians and other benthic fauna.

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