''Ceramium virgatum'', or the red hornweed, is a small red
marine alga
Marine primary production is the chemical synthesis in the ocean of organic compounds from atmospheric or dissolved carbon dioxide. It principally occurs through the process of photosynthesis, which uses light as its source of energy, but it a ...
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Description
This small alga grows erect with cylindrical filamentous axes.
[Hardy, F.G. and Guiry, M.D. 2003. ''A Checklist and Atlas of the Seaweeds of Britain and Ireland.'' The British Phycological Society ] It is repeatedly branched,