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. Accepted name: Acrochaetium sparsum (Harvey) Nägeli, 1862. AphiaID: 144389.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Nemaliophycidae; Acrochaetiales; Acrochaetiaceae; Acrochaetium