Description: Thallus erect to 20 cms long and to 40 cms broad with one or more blades on a short stipe. Blades monostromatic when young later 3-4 cells thick. Basically fan-shaped but may devide into overlapping lobes. Veins macroscopic.

Habitat: Epilithic and epiphytic in the sublittoral on rock, boulders and Laminaria to 19 m.

Distribution: Basically south-western around the British Isles but has been recorded from the north of Ireland and the Shetlands. Europe: Portugal and Spain.

Similar Species: Erythroglossum laciniatum; Haraldiophyllum bonnemaisonii; Drachiella heterocarpa.

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

iNaturalist: Polyneura bonnemaisonii at iNaturalist World Species Observations database.

WoRMS: Polyneura bonnemaisonii at World Register of Marine Species. Accepted name: Polyneura bonnemaisonii (C.Agardh) Maggs & Hommersand, 1993. AphiaID: 144777.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Delesseriaceae; Nitophylloideae; Phycodryeae; Polyneura