Halimeda rectangularis J. Agardh, 1894a: 100–101 (type locality: northwestern Australia).—Hillis, 1959: 377.— Hillis-Colinvaux, 1980: 157.
INDIAN OCEAN DISTRIBUTION: Australia.
Note: Hillis-Colinvaux (l.c.) was not able to locate authentic specimens and thus considered this species to be of uncertain systematic position.