Abstract
Coelarthrum opuntia (Rhodophyta) is frequently wounded by epiphytic growth, herbivore-attack and/or wave-action. Wound-repair involved cell divisions in the cortical region just below the wound-site to form a mass of cells. The wound-site was veneered by a thick and protective extracellular mucilaginous cover rich in carboxylated and sulphated polysaccharides. Medullary tissue contributed to regeneration of new fronds identical to those of the parent thallus. Regeneration capacity was higher in the apical regions whereas the lower internodal regions revealed proliferation in response to wounding.
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