“…It is generally accepted that the fibrillar material corresponds to the alginates and the amorphous material to the fucans (McCully, 1965(McCully, , 1968Novotny and Forman, 1975). Our previous electron microscopic study of bud initiation and development in the brown alga Sphacelaria furcigera Kiitz (Burns, Oliveira and Bisalputra, 1981), revealed that the cell wall was also composed of fibrillar material embedded in an amorphous matrix. The distribution of fibrillar material was not homogenous and four distinct ' morphological' layers were recognized in the outer longitudinal cell wall prior to bud initiation.…”