Epithelantha micromeris var. unguispina (Boed.) Backeb. in Cactus (Paris) 39: 31. 1954
Epithelantha micromeris var. unguispina in Cactus (Paris) 39: 31. 1954
is new combination for Mammillaria micromeris var. unguispina in Monatsschr. Deutsch. Kakteen-Ges. 4: 118. 1932