Bought some Pseudolithos migiurtinus seeds on ebay.
This is the newest member of my ugly cactus/succulent collection.
I have them controlled for temp, light and humidity using a light bulb for heat, my LED grow lamp for light and plastic bags for humidity. Heat is easily controlled by checking the temp and moving the light bulb. As for soil I started with a commercial cactus soil.
Here they are just sprouted about 5 days after planting them:
On DOL 3 transfered one to a more appropriate soil:
-one part commercial potting soil (baked in oven to sterilize)
-one part perlite
-one part washed play sand
Much larger at 2 and a half months old
As I had been warned was possible if not likely with this species it suddenly melted away overnight. No idea why. About a year and a half old at the time.