Description: Fronds simple or dichotomously branched to 7 cms long and thin at base and apex.

Habitat: Rare. Lower littoral, epiphytic on Zostera.

Distribution: Recorded in the British Isles only from the south coast of England and the west of Ireland.

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

iNaturalist: Cladosiphon contortus at iNaturalist World Species Observations database.

WoRMS: Cladosiphon contortus at World Register of Marine Species. Accepted name: Cladosiphon contortus (Thuret) Kylin, 1940. AphiaID: 144911.

Classification: Biota; Chromista; Harosa; Heterokonta; Ochrophyta; Phaeophyceae; Fucophycidae; Ectocarpales; Chordariaceae; Cladosiphon