The following taxon apparently lies within the circumscription of Gelidiella acerosa but has not yet been transferred or reduced to synonymy:
Sphaerococcus radicans Bory de Saint-Vincent, 1834: 165 (type locality: Mauritius).—Montagne, 1842c: 47–48, pl. III: fig. 4a.— Kützing, 1849: 773–774.— G. Martens, 1868: 94–95.
Gracilaria radicans (Bory de Saint-Vincent) Montagne, 1846a: 103.
Gelidium radicans (Bory de Saint-Vincent) Kützing, 1849: 767.
Gelidium rigidum (C. Agardh) Greville var. radicans (Bory de Saint-Vincent) J. Agardh, 1851 [1851–1863]: 469.
INDIAN OCEAN DISTRIBUTION: India, Mauritius, Sri Lanka.