Description: Very small uniseriate filaments, erect axes rising from prostrate disk to no more than 1 mm high, virtually unbranched.

Habitat: Very rare. Epiphytic on other algae in the lower littoral and upper sublittoral.

Distribution: British Isles: Ireland, England and Wales (Puffin Island, Anglesey). Europe: Faeroes.

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

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

iNaturalist: Acrochaetium seiriolanum at iNaturalist World Species Observations database.

WoRMS: Acrochaetium seiriolanum at World Register of Marine Species. Accepted name: Acrochaetium seiriolanum (Harvey-Gibson) Hamel, 1927. AphiaID: 1309272.

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