Fully (complinately) branched with branches arranged on each side of one axis (pinnate). Branches have regular flexible joints (intergeniculum). Arises from a calcified crust (crustose). Red-purple through to fading grey. Up to 6 cm long (thallus).
This species name "officinalis" refers to use of this seaweed in medicine, as with other species that contain that name. It was used in early Europe to expel intestinal worms and it is still used in medicine today when dried and converted to a substance used in bone grafting.
Sublittoral (low intertidal), tidal pools and subtidal rock reef, exposed coasts, to depth of 19 m.
Photosynthetic - sunlight
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed