The following taxon apparently lies within the circumscription of Litosiphon pusillus but has not yet been transferred or reduced to synonymy:
Asperococcus pusillus (Carmichael) Harvey var. major Grunow, 1867: 48–49 (type locality: St. Paul Island).—Reichardt, 1871: 22.— Hemsley, 1884: 281 (without varietal designation).
INDIAN OCEAN DISTRIBUTION: St. Paul Island.