information on the biology of species and the ecology of habitats found around the coasts and seas of the British Isles

A red seaweed (Callophyllis laciniata)

Distribution data supplied by the Ocean Biogeographic Information System (OBIS). To interrogate UK data visit the NBN Atlas.



A short soft, fleshy thallus arises and expands immediately from a small round (discoid) holdfast. The stipe is inconspicuous or absent and the crimson, brownish or purple-red fronds are much divided spreading out into wedge shaped divisions of about 1-3 cm broad. The whole blade can be up to 15 cm long and fan shaped with overlapping sections. Frond tips are rounded and end in tiny marginal leaflets giving a fringed appearance.

Recorded distribution in Britain and Ireland

Recorded throughout the British Isles, but uncommon in the south east of England between Hampshire and Suffolk, probably due to lack of suitable substrata.

Global distribution

Faeroes; Norway and Sweden to Morocco; Mediterranean.


Callophyllis laciniata can be commonly found attached to rock in the lower littoral and shallow sublittoral to at least 30 m. It is also often found attached to kelp stipes and holdfasts on both sheltered and exposed shores.

Depth range


Identifying features

  • Soft fleshy red thallus.
  • Thallus arising immediately from holdfast.
  • No conspicuous stipe.
  • Repeatedly branched wedge shaped fronds displaying a fan shaped blade.

    Additional information

    Often confused with Cryptopleura ramosa with which it often grows and can be distinguished if Cryptopleura ramosa shows iridescence as Callophyllis lacinata does not.

    Listed by

    - none -

    Further information sources

    Search on:


    1. Dickinson, C.I., 1963. British seaweeds. London & Frome: Butler & Tanner Ltd.

    2. Hardy, F.G. & Guiry, M.D., 2003. A check-list and atlas of the seaweeds of Britain and Ireland. London: British Phycological Society

    3. Hiscock, S., 1986b. A field key to the British Red Seaweeds. Taunton: Field Studies Council. [Occasional Publication No.13]

    4. Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]

    5. Irvine, L.M., 1983. Seaweeds of the British Isles vol. 1. Rhodophyta Part 2A. Cryptonemiales (sensu stricto), Palmariales, Rhodymeniales. London: British Museum (Natural History).

    6. Picton, B.E. & Costello, M.J., 1998. BioMar biotope viewer: a guide to marine habitats, fauna and flora of Britain and Ireland. [CD-ROM] Environmental Sciences Unit, Trinity College, Dublin.


    1. Centre for Environmental Data and Recording, 2018. Ulster Museum Marine Surveys of Northern Ireland Coastal Waters. Occurrence dataset accessed via on 2018-09-25.

    2. Fenwick, 2018. Aphotomarine. Occurrence dataset Accessed via on 2018-10-01

    3. Kent Wildlife Trust, 2018. Kent Wildlife Trust Shoresearch Intertidal Survey 2004 onwards. Occurrence dataset: accessed via on 2018-10-01.

    4. Manx Biological Recording Partnership, 2017. Isle of Man wildlife records from 01/01/2000 to 13/02/2017. Occurrence dataset: accessed via on 2018-10-01.

    5. Manx Biological Recording Partnership, 2018. Isle of Man historical wildlife records 1990 to 1994. Occurrence dataset: accessed via on 2018-10-01.

    6. NBN (National Biodiversity Network) Atlas. Available from:

    7. OBIS (Ocean Biogeographic Information System),  2020. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. Accessed: 2020-11-24

    8. Outer Hebrides Biological Recording, 2018. Non-vascular Plants, Outer Hebrides. Occurrence dataset: accessed via on 2018-10-01.

    9. Royal Botanic Garden Edinburgh, 2018. Royal Botanic Garden Edinburgh Herbarium (E). Occurrence dataset: accessed via on 2018-10-02.


    This review can be cited as:

    Neish, A.H. 2006. Callophyllis laciniata A red seaweed. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 24-11-2020]. Available from:

    Last Updated: 07/11/2006