Gymnocereus microspermus (Werderm. & Backeb.) Backeb., Cactaceae 2: 923. 1959 Gymnocereus microspermus (Werderm. & Backeb.) Backeb., Cactaceae 2: 923. 1959is new combination for Cereus microspermus Werderm. & Backeb., Neue Kakteen: 80. 1931Taxon for this nameGymnocereus microspermus (Werderm. & Backeb.) Backeb., Cactaceae 2: 923. 1959