The taxon Ceramium siliquosum is a small marine alga.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 belongs to the red algae genus Ceramium.
Description This small red alga grows to no more than 18 cm high. It is basically monosiphonous with distinct main branches which are cylindrical and corticated at the nodes. These incompletely corticate internodes appear collar-like around the branches. The tips of the branches are curled inwards and do not bear spines.
Reproduction The gametophytes are dioecious. Spermatangia occur in sori which cover the cortical bands. Cystocarps containing carposporangia and terasporangia occur in whorls at the nodes.
Habitat Found growing as an epiphyte on other algae in rock pools of the lower littoral to 12m depth.
Distribution Recorded from Ireland from County Donegal.Morton, O. 2003. The marine macroalgae of County Donegal, Ireland. Bulletin of Irish biogeography Society No. 27 pp.3 - 164 and Great Britain. In Europe from France and Spain.
References