Thelocactus nidulans (Quehl) Britton & Rose, Cactaceae 4: 9, f. 8. 1923
Thelocactus nidulans, Cactaceae 4: 9, f. 8. 1923
is new combination for Echinocactus nidulans in Monatsschr. Kakteenk. 21: 119. 1911
Thelocactus nidulans, Cactaceae 4: 9, f. 8. 1923
Taxon for this name