PORT PHILLIP BAY


Brown Seaweed 

Seirococcus axillaris

View scientific description and taxonomy

Scientific Details

Can be confused with Scytothalia dorycarpa which differs by having larger receptacles in the branching forks and more open branching.

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:
Seirococcaceae
Genus:
Seirococcus
Species:
axillaris

General Description

Short stipe, cylindrical in shape and tapering at both ends. Stems (blades) flattened on one plane. Multiple branching in an alternate pattern. Branches (laterals) are straight to curving slightly inwards in shape. Pale mid rib. Short leaf-like projections (receptacles) arise in inner branching fork. Holdfast at base is large with few or many roots (haptera). Medium to dark brown. Up to 2 m long (thallus).

Biology

The small leaf-like projections along the frond edges of this species contain reproductive structures. They release spores into the water and are visible only when the plant is in its reproductive cycle.

Habitat

Subtidal rocky reefs, with moderate wave action, to depth of 40 m.

Reefs

Seagrass meadows

Distribution guide

Southern Australia.

Species Group

Seaweeds and seagrasses Brown algae

Depth

Shallow (1-30 m)

Water Column

On or near sea floor

Max Size

2 m

Diet

Photosynthetic - sunlight

Commercial Species

No

Global Dispersal

Native to 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, Brown Seaweed, Seirococcus axillaris, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 19 Oct 2017, http://portphillipmarinelife.net.au:8098/species/11189

Text: creative commons cc by licence