Uebelmannia

Description: Solitary cactus 50(-80)cm tall.
Stem: Although usually globular or slightly elongated in cultivation, it is reported to grow to as much as 800mm tall and 10-15 cm wide. It is dark reddish-green to reddish-brown, with off-white scales. (In cultivation the colour of the plants depends on sun exposure, the plants grown in shadow are green with white stripes, while the ones in full sun take on a dark frost brown or purple colour)
Ribs: 15 to 18, vertical and prominent.