"Probably the most popular species of the genus in cultivation, it needs protection from cold and damp, but doesn�t like to get bone dry, even in winter."

"It needs regular watering, especially during the hottest summer days; provide also some light watering if the green house temperatures in winter are elevated. Either excessive or very scarce watering can induce rot."

http://www.cactus-art.biz/schede/PSEUDOLITHOS/Pseudolithos_migiurtinus/Pseudolithos_migiurtinus/Pseudolithos_migiurtinus.htm

That's a nice one. I had a couple that I started from seed and one I bought from Arid Lands. I had no problem getting them thru the winter but lost all of them over the summer : (