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A comparative histochemical study of the localization of galactosyl residues and lectin binding sites in the cytoplasm, the cell walls and the mucilage has been undertaken in tissue of the red algae, Hypnea musciformis, Polysiphonia deusta and Halarachnion ligulatum using fluorescent probes. The lectins revealed a unique and specific binding pattern in all species examined. The data obtained with fluorescent probes were compared with those obtained by bright field light microscopy. Neutral and acidic polysaccharides were noted in the cell walls while the mucilaginous component of all species was a highly sulfated acidic polymer. Cellulose was judged reasonably to constitute a great part in the vegetative tissue of all three species examined.

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