Thelocactus rinconensis var. nidulans (Quehl) Glass & R.A.Foster in Cact. Succ. J. (Los Angeles) 49: 245. 1977
Thelocactus rinconensis var. nidulans in Cact. Succ. J. (Los Angeles) 49: 245. 1977
is new combination for Echinocactus nidulans in Monatsschr. Kakteenk. 21: 119. 1911