PORT PHILLIP BAY


Red Seaweed 

Plocamium cirrhosum

View scientific description and taxonomy

Scientific Details

Can be confused with Plocamium dilatatum which is more robust, has larger ramuli and has a wider, specialised branch. Also confused with Plocamium angustum which has more narrow branches and lacks the strongly serrated ramuli.

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:
cirrhosum

General Description

Slender, erect fronds. Fronds have a light centre appearing as a midrib (costate) mid and lower on frond. Branchlets (ramuli) curve inwards, and are strongly serrate with short peg-like blunt teeth on the outer edge (margin). Base lies flat on surface (prostrate). Reproductive stichidia clusters branched. Pink to medium-red. Up to 30 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 20 m.

Reefs

Distribution guide

Phillipines, New Zealand and Australia.

Species Group

Seaweeds and seagrasses Red algae

Depth

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, Red Seaweed, Plocamium cirrhosum, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 23 Aug 2017, http://portphillipmarinelife.net.au:8098/species/12320

Text: creative commons cc by licence