RHODOPHYTA : Peyssonneliales : PeyssonneliaceaeRED ALGAE

Peyssonnelia harveyana P Crouan et H Crouan ex Agardh


Description: Hard crusts up to 5 cms across, adherent except at the margins. When dry, clear striations are visible and the margins curle up.

Habitat: Rarely recorded. Epilithic or epiphytic on coralline algae or kelp holdfasts in the upper sublittoral and to a depth of 12 m.

Distribution: Widely distributed around the British Isles. Europe: Mediterranean, Portugal and Spain. Further afield: Canary Islands.

Similar Species: Other species of Peyssonnelia.

Key Identification Features:

  • Distinguished by radial striations seen best when dry.

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

iNaturalist: Peyssonnelia harveyana at iNaturalist World Species Observations database.

WoRMS: Peyssonnelia harveyana at World Register of Marine Species.

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 Morton, O., Keatley, L., Morrow, C.C. & Picton, B.E. (2026). Peyssonnelia harveyana. P Crouan et H Crouan ex Agardh. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://habitas.org/mbdp/species.php?item=ZM3680. Accessed on 2026-11-01