CHLOROPHYTA : Bryopsidales : CodiaceaeGREEN ALGAE

Codium tomentosum Stackhouse


Description: Thallus dichotomously branched, terete, to over 20 cms long with a felt-like surface and spongy feel. Utricles with rounded apices.

Habitat: Uncommon. Epilithic in rock pools of the lower littoral.

Distribution: Mainly on the western shores of the British Isles. Europe: Mediterranean, Azores, Portugal, Spain, France, Netherlands and Norway. Further afield: Sri Lanka and Japan.

Similar Species: Othere species of Codium save C. adhaerens and C.bursa.

Key Identification Features:

  • Dichotomous branching. Utricles with rounded apices.

Distribution Map from NBN: Codium tomentosum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Codium tomentosum at iNaturalist World Species Observations database.

WoRMS: Codium tomentosum at World Register of Marine Species.

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 Morton, O., Keatley, L., Morrow, C.C. & Picton, B.E. (2026). Codium tomentosum. Stackhouse. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://habitas.org/mbdp/species.php?item=ZS4220. Accessed on 2026-11-01