''Ceramium'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
Ceramium algae (or Rhodophyta). It is a large genus with at least 15
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
in the
British Isles
The British Isles are an archipelago in the Atlantic Ocean, North Atlantic Ocean off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Inner Hebrides, Inner and Outer Hebr ...
.
[''Maggs, C.A. and Hommersand, M.H.'' 1993. ''Seaweeds of the British Isles. vol.1, Rhodophyta Part 3A Ceramiales.'' HMSO & Natural History Museum, London. ]
The fully