Titanopsis calcarea (Marloth) Schwantes in Z. Sukkulentenk. 2. 1926 sec. Hartmann 2017
- ≡Mesembryanthemum calcareum Marloth in Trans. S. African Philos. Soc. 18: 45. 1907 syn. sec. Hartmann 2017
- –Titanopsis fulleri Tischer ex H.Jacobsen, Succ. Pl.: 249. 1935, nom. inval., syn. sec. Hartmann 2017