Description: Thallus in tufts, erect to 8 cm, branches terete without a distinct main axis. All axes with 10 - 12 pericentral cells and ecorticate. Cystocarps ovoid.

Habitat: Very rare. Epilithic and epiphytic in deep pools at very low littoral.

Distribution: Recorded in the British Isles only from Dorset. Europe: Mediterranean and France. Further afield: the Canary Islands.

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

iNaturalist: Polysiphonia ceramiaeformis at iNaturalist World Species Observations database.

WoRMS: Polysiphonia ceramiaeformis at World Register of Marine Species. Accepted name: Vertebrata simulans (Harvey) Kuntze, 1891. AphiaID: 651353.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Rhodomelaceae; Polysiphonieae; Polysiphonia