Description: Very small prostrate axes growing on a Cladophora, each axis of no more than 3-5 cells, occasionally branched.

Habitat: Very rare. Epiphytic on Cladophora, sublittoral to 4 m.

Distribution: Known only from Scapa Flow, Orkney in the British Isles.

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

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

iNaturalist: Acrochaetium scapae at iNaturalist World Species Observations database.

WoRMS: Acrochaetium scapae at World Register of Marine Species. Accepted name: Acrochaetium scapae (Lyle) Papenfuss, 1945. AphiaID: 373855.

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