Description: Thallus a flattened blade attached by a discoid holdfast. The frond which may split longitudinally, is up to 10 cms or more long, 2 cms wide and 1 to 2 (rarely 4) cells thick.

Habitat: Uncommon. Epiphytic in the lower littoral and upper sublittoral.

Distribution: Widely distributed around the British Isles. Europe: Mediterranean, Portugal, Spain, France, Netherlands, Denmark, Baltic, Sweden, Norway and Faroes. Atlantic coast of North America: Canada and U.S.A.

Similar Species: Other species of Punctaria.

Key Identification Features:

• Thin ribbon-shaped blades.

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

iNaturalist: Punctaria tenuissima at iNaturalist World Species Observations database.

WoRMS: Punctaria tenuissima at World Register of Marine Species. Accepted name: Punctaria tenuissima (C.Agardh) Greville, 1830. AphiaID: 145348.

Classification: Biota; Chromista; Harosa; Heterokonta; Ochrophyta; Phaeophyceae; Fucophycidae; Ectocarpales; Chordariaceae; Punctaria