Description: Hard crusts up to 20 cms across with faint striations

Habitat: Rare. Epilithic on shells or epiphytic in the lower littoral and sublittoral to 19 m.

Distribution: Widely distributed in the British Isles on western coasts of England, Ireland and Scotland including the Shetlands. Europe: France.

Similar Species: Other species of Peyssonnelia and Haematocelis rubens.

Key Identification Features:

• Margins closely attached to the substrate.

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

iNaturalist: Peyssonnelia immersa at iNaturalist World Species Observations database.

WoRMS: Peyssonnelia immersa at World Register of Marine Species. Accepted name: Peyssonnelia immersa Maggs & L.M.Irvine, 1983. AphiaID: 145280.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Peyssonneliales; Peyssonneliaceae; Peyssonnelia