Greg Daniels
Living Stones, Split Rocks,and other mesembs Lithops, Glottiphyllum, Acrodon, Titanopsis, Conophytum, Cheiridopsis, Schwantesia, Bergeranthus, Aloinopsis, Tanquana, Frithia, Fenestraria, Neohenricia, Pleiospilos plus many other genera as well as ground covering plants.
For current list:
Alice Daniels
Epiphytic Cacti, Epicactus, Lepismium, Rhipsalis, Zygocactus, Epiphyllum.
For current list:
