i see, people from all over the world join this forum, that's great. i collect cactus for over 30 years. my favourite ones are mammillaria, rebutia and parodia. unfortunatelly, collecting has the disadvantage, that you always run out of space. so i' m always busy with arrangeing my greenhouse differently, that some new ones find a little place there.
so, i look forward to learn more here about the mammillaria.