Description: Encrusting coralline spreading to 6 cms in diameter and 4 mm thick, flat with no upright branches. A thick margin without orbital ridges and showing fine delicate watermarks.

Habitat: Quite common. Epilithic and epizoic in low littoral and sublittoral to 90 m.

Distribution: Generally around the British Isles. Europe: Spain to Norway. Atlantic coast of North America: Canada and Massachusetts.

Similar Species: Phymatolithon laevigatum.

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

iNaturalist: Phymatolithon lamii at iNaturalist World Species Observations database.

WoRMS: Phymatolithon lamii at World Register of Marine Species. Accepted name: Phymatolithon lamii (Me.Lemoine) Y.M.Chamberlain, 1991. AphiaID: 145201.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Corallinophycidae; Hapalidiales; Hapalidiaceae; Phymatolithon