Mammillaria rozcekii

I have bought two plants ofM.rozcekii this year and both are quite elongated.All pictures I have seen in different mammillaria fora have shown small globular plants.Are my plants victims of low light growing or is this something that happens with plants growing in culture?

Goodnight Thorn. I have only one Mammillaria rozcekii. I grow on a terrace, but with direct sunshine most of the day. It does not seem elongated to me. I'll try to add a picture, so you can judge.

Thank you for the answer,Kissifrot.Seems that my plants have been grown under less favorable conditions.Since all my plants are standing outside in the garden in the summer I´ll just hope that myplants will stop growing lengthwise and fill out a bit

I have a coupl eof M. roczekii plants, one which I grew from seed and another on a graft. The one from seed is reasonably round, but the grafted one has bigger and longer stems.
Sometimes nurseries graft difficult or rarer species from small seedlings and then take off the graft and root htme down, so they can they sell as "own roots" which tends to command a higher price. It is possible that your plant has come from this kind of cultivation. Hopefully given a bit of time and good light, it will become a more typical shape.
But the heads will get longer as the plant ages. It is, after all, just a variety of M. saboe, whose smaller heads do elongate with age and as the plant clumps up with many heads.

My plants of this ssp. have a strong tendency to elongate as well. The illustrated plant is grown from seed and not grafted.

Wiebe

Thank you Chris and Wiebe for your answers.
Thord