The type subspecies of this Chilean cactus is distinguished from the more diminutive ssp. laui by its larger, usually solitary heads to 6.5 cm diameter, atop thick, tuberous roots. Its roughened epidermis is paler olive-green to brown and is visible through the short, open spination. The form offered here has remarkably rough skin, with folds and fissures, which have led it to be called the “lizard skin” form. This is reported from the area along the coast north of Chañaral, in the Atacama Desert of Chile. The 2 cm yellow flowers are similar in both subspecies. HBG 104719, plants selected for their roughness. $10.