| In view of preparing a Flora of the Seaweeds of N. Papua New Guinea, material was collected by scuba-diving along the coast of Madang Province in June-August 1980 and July-August 1986. The Caulerpales are the first group to be studied. Thirteen taxa belonging to the genus <i>Caulerpa</i> are described and illustrated; ecological and biogeographical data are added. The list includes <i>C. brachypus, C. elongata, C. filicoides</i> var. <i>andamanensis, C. lentillifera</i> var. <i>kilneri, C. manorensis, C. microphysa, C. opposita</i> sp.nov., <i>C. racemosa</i> var. <i>clavifera, C. racemosa</i> var. <i>peltata, C. serrulata</i> var. <i>serrulata, C. serrulata</i>... |
