Results of the present writer's observations on vegetative propagation occurred in Dictyopteris latiuscula (Okamura) Okamura (Dictyotaceae, Phaeophyta) in nature are presented in this report.
Vegetative propagation in Dictyopteris latiuscula occurred both from the blade and from the adventitious rhizoid. Juvenile gemmae were cylindrical to subcylindrical and then became a little compressed and underwent apical growth. Thereafter they became the flattened and spatulate by replacing the apical cell to the marginal meristem, and the gemmae further developed into the typical dichotomously branched thallus with a　prominent midrib and many proximal secondary rhizoids. Vegetative propagation of this species occurred in early September in the Oki Islands.