PORT PHILLIP BAY


Neptune's Necklace 

Hormosira banksii

View scientific description and taxonomy

Scientific Details

Main information sources:
Womersley, H.B.S., (1984-2003). The Marine Benthic Flora of Southern Australia. Part 1-3d. Govt. Printer, South Australia.
Baldock, R.N. 2010. Algae Revealed. South Australian State Herbarium. Website.
AlgaeBase. Website.

Taxonomy

Phylum:
Ochrophyta
Subphylum:
Phaeista
Superclass:
Fucistia
Class:
Phaeophyceae
Order:
Fucales
Family:
Hormosiraceae
Genus:
Hormosira
Species:
banksii

General Description

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).

Biology

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.

Habitat

Intertidal rocky reefs and shallow subtidal reefs, to depth of 1 m.

Reefs

Coastal shores

Distribution guide

New Zealand and southern Australia.

Species Group

Seaweeds and seagrasses Brown algae

Depth

Shore (0-1 m)
Shallow (1-30 m)

Water Column

On or near sea floor

Max Size

30 cm

Diet

Photosynthetic - sunlight

Commercial Species

No

Global Dispersal

Recorded in Australia

Identify

Conservation Status

  • DSE Advisory List : Not listed
  • EPBC Act 1999 : Not listed
  • IUCN Red List : Not listed

Author

article author Pocklington, Jacqui

Jacqui Pocklington is a Research Associate with expertise in algal taxonomy.

citation

Cite this page as:
Pocklington, Jacqui, 2011, Neptune's Necklace, Hormosira banksii, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 25 Mar 2017, http://portphillipmarinelife.net.au:8098/species/11129

Text: creative commons cc by licence