Description: Fronds erect but small, no more than 4 cms long with irregular branching. Growing turf- like, attached or embedded in mud or salt-marches.

Habitat: Tidal salt-marches. Supralittoral along with angiosperms Juncus maritimus and Armeria maritima forming dense mossy carpets.

Distribution: Very rare. Mainly recorded from western Ireland, Scotland and England. Europe: Spain, Atlantic coast of France and Norway.

Key Identification Features:

• Small turf-like. In brackish sites.

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

iNaturalist: Fucus cottonii at iNaturalist World Species Observations database.

WoRMS: Fucus cottonii at World Register of Marine Species.