Description: Thallus cylindrical, erect and densely branched to 8 cms long. Older branches can be clearly seen to be corticate only at the nodes.

Habitat: Epilithic and epiphytic from upper to low-littoral.

Distribution: Widely distributed in the British Isles from the Shetlands to the Scilly Isles. Europe: Spain, France, Netherlands, Denmark, Baltic Sea, Norway and Iceland. Atlantic coast of North America: Canada, Maine to Connecticut. Further afield: Canary Islands.

Similar Species: Other species of Ceramium which are without spines and corticate only at the nodes.

Key Identification Features:

• Corticate only at the nodes. Without spines.

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

iNaturalist: Ceramium deslongchampii at iNaturalist World Species Observations database.

WoRMS: Ceramium deslongchampii at World Register of Marine Species. Accepted name: Ceramium deslongchampsii Chauvin ex Duby, 1830. AphiaID: 144545.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Ceramiaceae; Ceramioideae; Ceramieae; Ceramium