Spyridia aculeata (C. Agardh ex Decaisne) Kützing forma inermis Børgesen, 1917: 239–240, fig. 230 (type locality: Green Cay Estate, St. Croix, Virgin Islands).
Spyridia aculeata (C. Agardh ex Decaisne) Kützing var. inermis (Børgesen) Børgesen, 1931: 15–16 (including Indian Ocean record).—Børgesen, 1934b: 42.— S. Dixit, 1966: 18.— V. Krishnamurthy & H. Joshi, 1970: 24.— Anil Kumar & Panikkar, 1993a: 21, figs. 3–6.— Menon et al., 1993: 59.
Spyridia hypnoides (Bory de Saint-Vincent) Papenfuss var. inermis (Børgesen) P. Silva.
INDIAN OCEAN DISTRIBUTION: India.