Description: Forms balls with a knobbly surface unlike Lithophyllum dentatum or Lithophyllum fasculatum.

Habitat: Rare. Forming a ball up to 4 cms in diameter, with branches arising in all planes.

Distribution: Apart from the holotype there is only one record of this species from the British Isles: Falmouth in Cornwall. The species may be extinct.

Similar Species: Lythophyllum dentatum (Kützing) Foslie, however the latter is less knobbly.

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

iNaturalist: Lithophyllum duckeri at iNaturalist World Species Observations database.

WoRMS: Lithophyllum duckeri at World Register of Marine Species. Accepted name: Lithophyllum racemus (Lamarck) Foslie, 1901. AphiaID: 145160.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Corallinophycidae; Corallinales; Corallinineae; Lithophyllaceae; Lithophylloideae; Lithophylleae; Lithophyllum