Description: Calcareous articulated frond growing from a crustose base and stolons. Branching dichotomously to 2.5 cms long.

Habitat: Rare. Epiphytic in the upper sublittoral and to a depth of 8 m.

Distribution: British Isles from Ireland, Scotland, Wales, south-west England, Isle of Man and the Channel Islands. Europe: Mediterranean, Azores, Portugal, Atlantic coast of Spain and France, Netherlands and the Baltic Sea. Atlantic coast of North America: North Carolina to Argentina. Further afield: Jamaica, the Canary Islands.

Similar Species: Corallina is similar but pinnately branched.

Key Identification Features:

• Epiphytic with dichotomous branching.

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

iNaturalist: Jania rubens at iNaturalist World Species Observations database.

WoRMS: Jania rubens at World Register of Marine Species. Accepted name: Jania rubens (Linnaeus) J.V.Lamouroux, 1816. AphiaID: 145130.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Corallinophycidae; Corallinales; Corallinineae; Corallinaceae; Corallinoideae; Janieae; Jania