Ceramium echionotum is a small marine alga in the division Rhodophyta.
Description This is a small branched alga no more than 15 cm long.Maggs, C.A. and Hommersand, M.H. 1993. Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales The Natural History Museum, London. It consists of large cells forming erect cylindrical filaments which are basically monosiphonous. At the nodes where the large axial cells meet there is cortication by small cells ascending and descending, these give a banded effect. The thalli grow in a rather tangled manner, matted at the base by rhizoids. The main branches are strongly rolled in at their apices and unicellular spines develop on the outer sides of the branches.Jones, W.E. 1964. A key to the genera of the British seaweeds. Field Studies Vol.1.(4) pp.1 - 32 The species is similar to Ceramium shuttleworthianum, Ceramium ciliatum and Ceramium gaditanum all of which have spines. In the British Isles, only Ceramium echionotum has spines formed of single cells which grow on the cortical bands.Newton, L. 1931. A Handbook of the British Seaweeds. British Museum, LondonHardy, F.G. and Guiry, M.D. 2003. A Check-list and Atlas of the Seaweeds of Britain and Ireland. The British Phycological Society.
Distribution Recorded in Ireland in the north-westMorton, O. 2003. The marine macroalgae of County Donegal, Ireland. Bulletin of Irish biogeographical Society 27: 3 - 164 and the north-east.Morton, O. 1994. Marine Algae of Northern Ireland Ulster Museum. Recorded from the east of Scotland, England, Isle of Man, the Channel Isles, Norway, the Canary Isles and the Azores.
Reproduction The species is dioecious producing spermatangia, carposporangia and tetraspores.
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