Branched chains of beads (vesicles) varying in shape from round to oval depending on habitat. Beads appear spotted/bumpy (conceptacles). Several simple or branched stalks can arise from a simple disc-like holdfast. Tan to dark brown. Up to 30 cm long (thallus).
This alga can form large mats on rock platforms and is the only persistent intertidal canopy-forming algal species in Victoria. The canopy forms important habitat for intertidal invertebrates and other algae such as gastropods, crustaceans, delicate red algae. It is very slow growing and is easily broken by human trampling and wild storms which reduces its habitat quality. No animals are known to graze on Hormosira, possibly because it contains chemicals in its cells that are thought to taste bad. Colonies are thought to mainly reproduce vegetatively, though individuals can also reproduce by releasing sperm or eggs into the water during low tide which meet and grow into new individuals.
Intertidal rocky reefs and shallow subtidal reefs, to depth of 1 m.
New Zealand and southern Australia.
Photosynthetic - sunlight
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed