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In recent years, the massive influx of pelagic <i>Sargassum</i> spp. has generated great interest in the scientific community, highlighting the urgency of addressing the physiology and biochemical composition of these species. Until now, the presence of lignified cells in the tissue of <i>Sargassum natans</i> and <i>Sargassum fluitans</i> has not been reported. Although ‘‘lignin-like’’ compounds have been identified in green algae, the presence of true lignin in the <i>Sargassum</i> genus has not been confirmed. Our work is the first report of lignified cells forming the secondary cell wall in these <i>Sargassum</i>. This study used histological techniques applied to thick sections for identifying lignin-like tissues in <i>Sargassum</i> spp. The dyes as Safranin O and Toluidine have been used to differentiate lignin and cellulose in conducting tissue and to indicate the presence, absence, and distribution of these compounds in tissues. This work is the initial study of the cell wall heteropolymers structure and arrangement in <i>Sargassum</i> spp., providing insights into the unique cell wall architecture of these seaweeds.