Soft, cylindrical, crimson to brownish red fronds, to 200 mm (usually much shorter). Much branched, axes constricted into bead-like portions, ramuli at nodes, often whorled. Base of creeping rhizoidal filaments.

Original publication: Lyngbye, H.C. (1819). Tentamen hydrophytologiae danicae continens omnia hydrophyta cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, systematice disposita, descripta et iconibus illustrata, adjectis simul speciebus norvegicis. pp. [i]-xxxii, [1]-248, 70 pls. Hafniae [Copenhagen]: typis Schultzianis, in commissis Librariae Gyldendaliae.

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Irvine, L.M. & Dixon, P.S. (1982). The typification of Hudson's algae: a taxonomic and nomenclatural reappraisal. Bull. Br. Mus. nat. Hist. (Bot) 10: 91-105.

Irvine, L.M. & Guiry, M.D. (1983). Rhodymeniales. In: Seaweeds of the British Isles. Volume 1. Rhodophyta. Part 2A. Cryptonemiales (sensu stricto), Palmariales, Rhodymeniales. (Irvine, L.M. Eds), pp. 77-98. London: British Museum (Natural History).

Loiseaux-de Goër, S. & Noailles, M.-C. (2008). Algues de Roscoff. pp. [1]-215, col. figs. Roscoff: Editions de la Station Biologique de Roscoff.

Womersley, H.B.S. (1998). The marine benthic flora of southern Australia - Part IIIC. Ceramiales - Ceramiaceae, Dasyaceae. pp. 535. Canberra & Adelaide: Australian Biological Resources Study & State Herbarium of South Australia.

Basionym: Ulva articulata Hudson

Type locality: Cornwall, England (Silva, Basson & Moe 1996: 350). Lectotype: original description (Hudson, 1772) in the absence of material (Dixon & Irvine 1977