Description: Thallus cylindrical, erect to 12 cms long. Densely branched and incompletely corticate. Rhizoids unicellular.

Habitat: Epiphytic and epilithic in the low-littoral.

Distribution: Probably under-recorded in the British Isles, generally south westerly, including the Channel Isles. Europe: the Mediterranean. Further afield: the Canary Islands and Australia. Probably cosmopolitan.

Similar Species: All Ceramium species with ecorticate internodes.

Key Identification Features:

• Unicellular rhizoids.

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

iNaturalist: Ceramium flaccidum at iNaturalist World Species Observations database.

WoRMS: Ceramium flaccidum at World Register of Marine Species. Accepted name: Gayliella flaccida (Harvey ex Kützing) T.O.Cho & L.J.McIvor, 2008. AphiaID: 377234.

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