PORT PHILLIP BAY


Red Seaweed 

Plocamium dilatatum

View scientific description and taxonomy

Scientific Details

Can be confused with Plocamium cirrhosum which is less robust, has smaller ramuli and has a more slender, stichidia.

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:
Rhodophyta
Subphylum:
Eurhodophytina
Class:
Florideophyceae
Subclass:
Rhodymeniophycidae
Order:
Plocamiales
Family:
Plocamiaceae
Genus:
Plocamium
Species:
dilatatum

General Description

Robust, compressed, erect fronds with multiple branches. Fronds have a central thickening, which becomes a midrib (costate) towards base. Branchlets (ramuli) occur in alternate pairs and curve strongly inwards. Outer edge (margin) of branchlet is serrated. Base lies flat on surface (prostrate). Reproductive stichidia clustered. Pink to medium-red. Up to 25 cm long (thallus).

Biology

When reproductive, a distinctive feature of this alga is a specialised branch (stichidia), which bears clusters of reproductive structures on short stems.

Habitat

Subtidal reef in moderate to rough waters, to depth of 22 m.

Reefs

Distribution guide

Australia.

Species Group

Seaweeds and seagrasses Red algae

Depth

Shallow (1-30 m)

Water Column

On or near sea floor

Max Size

25 cm

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, Red Seaweed, Plocamium dilatatum, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 23 Nov 2017, http://portphillipmarinelife.net.au:8098/species/12319

Text: creative commons cc by licence