I've tried to pollinate my two titanopsis calcarea plants this year and apparently it worked. Both have developed seed capsules with nice fat seeds inside.
I'm very fond of these plants, their leaves look like they're made of tiny stones or sand grains. If watered too much this interesting property will fade resulting in long leaves with very indistinct surface texture. "Less water" is the secret of a compact "grainy" plant.
UPD: There were more than 150 seeds inside!