Description: Very small tufts growing in a the host alga. Erect filaments to 1.5 mm long, simple rarely branched. Partially endophytic.

Habitat: Not uncommon. On the receptacles of Himanthalia lorea.

Distribution: Recorded from scattered sites around the British Isles from the Shetlands to the Scilly and Channel Islands. Europe: Mediterranean, Portugal, Spain, France, Netherlands, Helgoland, Norway and Faroes.

Similar Species: Many other small tufted algae are similar, all require microscopic examination for identification.

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

iNaturalist: Herponema velutinum at iNaturalist World Species Observations database.

WoRMS: Herponema velutinum at World Register of Marine Species. Accepted name: Herponema velutinum (Greville) J.Agardh, 1890. AphiaID: 145428.

Classification: Biota; Chromista; Harosa; Heterokonta; Ochrophyta; Phaeophyceae; Fucophycidae; Ectocarpales; Acinetosporaceae; Herponema