Dilsea carnosa

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Dilsea carnosa
Dilsea carnosa Crouan.jpg
Scientific classification
Kingdom: Plantae
Division: Rhodophyta
Class: Florideophyceae
Order: Gigartinales
Family: Dumontiaceae
Genus: Dilsea
Species: D. carnosa
Binomial name
Dilsea carnosa
(Schmidel) Kuntze (1898)

Fucus carnosus Schmidel (1794)
Fucus edulis Stackhouse (1801)
Dilsea edulis Stackhouse (1809)
Ulva edulis (Stackhouse) Lyngbye (1819) Halymenia edulis (Stackhouse) C.Agardh (1822)
Iridaea edulis (Stackhouse) Bory de Saint-Vincent (1830)
Schizymenia edulis (Stackhouse) Kleen (1874)
Sarcophyllis edulis (Stackhouse) J.Agardh (1876)

Dilsea carnosa, in Carantec

Dilsea carnosa, commonly known as the poor man's weather glass or the sea belt, is a species of red algae in the Dumontiaceae family of the order Gigartinales.


The species was first described scientifically by Schmidel in 1794, under the name Fucus carnosus. The German botanist Otto Kuntze transferred the species to Dilsea in 1898.[1]


This red alga is dark red and flattened and somewhat leathery. It may be 30 cm or more long and 15 cm wide. It is usually not branched but may split.[2]


Attached to rock in the lower littoral,[3]to a depth of 24m or more.[4]It grows from a discoid holdfast with a short stipe.[5]


The gametangial plants are dioecious, with male and female gametangia on separate plants. The spermatangia, male gametes, occur in patches near the edges of the fronds. Carposporangia release spores. Tetraspores occur near the margins and consist of four spores.[4]


Generally distributed around the British Isles and from Portugal to Arctic Russia.[4]


  1. ^ Kuntze, O. (1898). Revisio generum plantarum. Part 3 (3). pp. 1-576. Leipzig, London, Milano, New York, Paris: Arthur Felix, Dulau & Co., U. Hoepli, Gust. A. Schechert, Charles Klincksierck.
  2. ^ Newton, L. 1931. A Handbook of the British Seaweeds. British Museum, London
  3. ^ Campbell, A.C. 1984. The Country Life Guide the Seashore and Shallow Seas of Britain and Europe. Country Life Books. ISBN 0 600 34396 0
  4. ^ a b c Irvine, L.M.1983. Seaweeds of the British Isles. Volume 1, Rhodophyta Part 2A. British Museum (Natural History) ISBN 0 565 00871 4
  5. ^ Dickinson, C.I. 1963. British Seaweeds The Kew Series