RHODOPHYTA : Acrochaetiales : AcrochaetiaceaeRED ALGAE

Acrochaetium sparsum (Harvey) Nägeli, 1862


Description: Very small uniseriate filaments with prostrate axes giving rise to erect axes, with few branches, no more than 0.5 mm high.

Habitat: Uncommon. Epiphytic on other algae, frequently Laminaria, sublittoral to 5 m.

Distribution: British Isles: widely distributed including the Shetland Islands. Europe: Atlantic coast of Spain and France, Norway.

Similar Species: All species of Acrochaetium are similar and microscopic examination is required for identification.

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

iNaturalist: Acrochaetium sparsum at iNaturalist World Species Observations database.

WoRMS: Acrochaetium sparsum at World Register of Marine Species.

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 Morton, O., Keatley, L., Morrow, C.C. & Picton, B.E. (2026). Acrochaetium sparsum. (Harvey) Nägeli, 1862. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://habitas.org/mbdp/species.php?item=ZM1440. Accessed on 2026-11-01