Description: Thallus solid, erect less than 13 mm long and 0.25 mm wide, cylindrical and linear.

Habitat: Very rare. Epilithic in pools of the lower littoral and sublittoral.

Distribution: Recorded only from Dorset, the Isle of Scilly and Argyll. Europe: Mediterranean, Denmark and Germany.

Similar Species: Other species of Asperococcus are similar. A. compressus is flattened, A. bulbosus is inflated and A.fistulosus is no more than 5 mm wide.Scytosiphon may appear similar but has

Key Identification Features:

• Dotted all over with sori of colourless hairs and sori.

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

iNaturalist: Asperococcus scaber at iNaturalist World Species Observations database.

WoRMS: Asperococcus scaber at World Register of Marine Species.