Ceramium circinatum is a small marine red algae.
Description This small red alga is filamentous, cylindrical with branched axes. It has 10 periaxial cells, that is a ring of cells forming a ring around the axis. It is not completely corticated and does not bear spines.Maggs, C.A. and Hommersand, M.H.1993 Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales. The Natural History Museum, London The apices of the branches are hooked inwards.Newton, L. 1931. A Handbook of the British Seaweeds. British Museum (Natural History)
Distribution This is a Mediterranean species. Records shown from Great Britain may be misidentifications as it may be mistaken as Ceramium virgatum.Hardy, F.G. and Guiry, M.D. 2003. A Check-list and Atlas of the Seaweeds of Britain and Ireland. British Philological Society However, it is reported from Iceland where the species is red listed a vulnerable species (VU).Náttúrufræðistofnun Íslands [Icelandic Institute of Natural History] (1996). Válisti 1: Plöntur. (in Icelandic) Reykjavík: Náttúrufræðistofnun Íslands.
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