Lithops fulviceps aurea

for violaceus or matanzanus with cephalium 15° MINIMUM

Hi Astro
you grow them outdoor because I see all these pine needles ?

Mammillaria formosa ??

one of the most resistant is Adromischus cooperi which in nature grows in corners where there is frost (Nieu Bethesda for example)
and also cristatus around Graaf Reinet
but the problem is always the same in our countries: humidity

Aloe or Gasteraloe ?

when Ecoscape introduced this plant in the US its main recommendation for the cuture of this wonderful species was that the roots should not have a temperature above 30 ° C above they necrosis
so in priority look at the rootswith the heat of this summer

Mammillaria polythele nuda
the first plants of this form were called Mammillaria toluca

crustal disease ??
it seems to me that there was an article in the magazine a few years ago

hookeri lutea ?