Porphyra suborbiculata Kjellman (Bangiaceae, Rhodophyta) is described with detail for the Pacific coast of Mexico, where was recently recorded, based on samples collected from western coast of Baja California between 1985 and 2001. We describe details of vegetative and reproductive morpho-anatomic characters of the thallus, as well as habitat and distribution on the Baja California coast.Se presenta una descripción extensa de Porphyra suborbiculata Kjellman (Bangiaceae, Rhodophyta), specierecientemente registrada para la costa del Pacífico de México, con base en material recolectado en la costaoccidental de Baja California, durante 1985-2001. Se describen en forma detallada los caracteres morfo-anatómicos y estructuras reproductoras de los talos; así como su hábitat y distribución en la costa de Baja California
