Description: Fine filamentous species, unbranched.

Habitat: Littoral and sublittoral. Also recorded from some inland sites.

Distribution: Widespread in the British Isles. Greenland. Atlantic coast of Europe including Netherlands.

Similar Species: Easily confused with other species microscopic species of Ulothrix.

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

iNaturalist: Ulothrix subflaccida at iNaturalist World Species Observations database.

WoRMS: Ulothrix subflaccida at World Register of Marine Species. Accepted name: Ulothrix subflaccida Wille, 1901. AphiaID: 145931.

Classification: Biota; Plantae; Viridiplantae; Chlorophyta; Chlorophytina; Ulvophyceae; Ulotrichales; Ulotrichaceae; Ulothrix