Description: Thallus a short stipe, erect of one or more blades to 16 cms long and 15 or 20 cms wide, fan-shaped devided into lobes with pointed apices. Veins macroscopic, also fine veins. Proliferations on the margin may curve down and reattach. Very variable.

Habitat: Epilithic in rock pools at extreme low littoral and sublittoral to 30 m.

Distribution: Generally around the British Isles including the Shetland Islands and Channel Isles. Europe: Mediterranean, Portugal and France.

Similar Species: Haralidiophyllum bonnemaisonii does not have microscopic or macroscopic veins. Cryptopleura ramosa has veins only one cell wide just behind the apices and smooth blade margins.

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

iNaturalist: Erythroglossum laciniatum at iNaturalist World Species Observations database.

WoRMS: Erythroglossum laciniatum at World Register of Marine Species.