I have not come across this genus until I went to my first meeting at British Cactus & Succulent Society (BCSS). A gentleman, from one of the Medway towns in Kent, came along with his plants, various pictures and spoke for a couple of hours. I was quite surprised to hear some of the things he said and those will be mentioned. The cacti in this genus are quite small and slow growing. The gentleman said he rarely waters them and together with things I have read, it made sense. They often become rot-prone and that is usually based on too much water. One of the books said that many are grafted and then grow quicker, but this gentleman did not have any that were. Many of them come from Mexico and some of them a funny shapes.
This Turbinicarpus krainzianus v. minimus looks, to me, like a golf ball on a tee. Books say that it produces white flowers however see the pictures below. The picture, without flowers, was shot in 2003 with the one with flowers was shot in 2005. The cactus is usually solitary with the average temperature no less than 10° centigrade (50° fahrenheit), but than survive a few hours of it being -4° centigrade (c. 25° fahrenheit).
Adromischus ~ Astrophytum ~ Cephalocereus ~ Cereus ~ Cyanotis ~ Echinopsis ~ Epiphyllum ~ Espostoa ~ Ferocactus ~ Frithia ~ Gymnocalycium ~ Haworthia ~ Hildewintera ~ Lithops ~ Lophocereus ~ Mammillaria ~ Notocactus ~ Opuntia ~ Pilosocereus ~ Rebutia ~ Schlumbergera ~ Sedum ~ Sempervivum ~ Stenocereus ~ Sulcorebutia ~ Tephrocactus ~ Weberbauerocereus