Abstract
Gracilaria edulis (Gmel.) Silva is represented by different morphological forms in the Mandapam region. The morphological variation of selected characters has been analyzed and quantified. Characters included basal branch constriction, branch endings, branch attenuation, stoutness of the thallus, angle of divergence of branches, branching index, sizes of medullary, subcortical and cortical cells, and gradation of cell size from cortex to medulla. All the characters showed continuous variation; however, branching index and branch attenuation showed significant negative correlation between them.
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