The aggregatus and iwarenge are quite interesting when they go into dormancy. All the stems disappear and all that is left is nothing. Well, at least that's what it looks like. I though I lost both plants over winter. Just last week I noticed what looked like tiny green bits of soil, it looked like moss starting up in the pot. Low and behold it is a bazillion little orostachy plants coming out of dormancy. No stems, no roots, just very tiny little green balls.
I should go out and take a photo.