SUMMARYA new species of red algae,Boldia angustatasp. nov., was discovered near Tuscaloosa, Alabama, during the spring of 1968. It differs significantly from the only previously described species,Boldia erythrosiphonHerndon, in length and width of young and mature thalli, cell size, shape of nuclei in first‐order cells, shape of intercalary filaments, morphology of filaments derived from monospores, ontogenetic development of erect plants, morphology of the basal system, and regularity of first‐order ce