Neoporteria islayensis var. grandis (Rauh & Backeb.) Donald & G.D.Rowley in Cact. Succ. J. Gr. Brit. 28: 56. 1966
Neoporteria islayensis var. grandis in Cact. Succ. J. Gr. Brit. 28: 56. 1966
is new combination for Islaya grandis in Sitzungsber. Heidelberger Akad. Wiss., Math.-Naturwiss. Kl.: 492. 1958