Abstract: | Cell wall structure and composition of fifty-one algae in the Volvocales, Tetrasporales, Chlorococcales, and Chlorosarcinales were investigated to determine the feasibility of using the presence of cellulose, wall fibers, and wall periodicity as taxonomic characters. Although members of the Volvocales consistently lack cellulose, the diversity of wall characters in the other orders discourages the use of these characters as taxonomic or phylogenetic criteria. |