Sargassum cylindrocystum Figari & De Notaris var. obockianum Grunow in Bornet, 1888: 18 (`obockiana') (type locality: Obock, Djibouti).—Grunow, 1915 [1915–1916]: 434.— Lawson, 1980: 27.
INDIAN OCEAN DISTRIBUTION: Djibouti.
Note: Lawson (1980: 27) also recorded this taxon as Sargassum cylindrocystum without varietal designation.