Echinofossulocactus densispinus Schmoll in Cact. Succ. J. (Los Angeles) 6: 37. 1934 Echinofossulocactus densispinus Schmoll in Cact. Succ. J. (Los Angeles) 6: 37. 1934Taxon for this nameEchinofossulocactus densispinus Schmoll