Gymnocalycium monvillei Caudiciform the pups can vary from

the pups can vary from mostly blue to almost entirely yellow

Normally it is green but this form has very attractive silver gray skin with darker spots and lines

This is more tropical than most cacti so it doesn't like cold weather and it also doesn't like to fully dry out

Note that the black color is strongest in high light

Then when it becomes mature enough they become upright which is what is starting to happen with these individuals

Gymnocalycium monvillei Caudiciform the pups can vary fromGymnocalycium monvillei Family: Cactaceae. A nice green species with big white to yellow spines. Clumps heavily when mature. Big white to pale pink flowers are produced all summer. Takes normal cactus care. Protect from frost. You will receive a plant shown in the last image or one similar. Plants shown in a 3. 5" pot. Important Shipping Information PLANTS ARE SHIPPED BARE ROOT If you want me to send them in pots send me a message to discuss. Extra