Ceraria namaquensis belongs to Family Portulacaceae and has a fairly widespread habitat in South Africa and Namibia. I have had plants of this grafted on to stems of Portulacaria afra for many years.
Marina launched her specialty Caudex booklets in year six of her print publication, The Amateurs’ Digest. The Caudex booklets are addressed to collectors of mostly Caudex plants. Unlike TAD, that was made from printers’ plates, the Caudex booklets are photocopies of Caudex articles collected from issues of The Amateurs’ Digest to that date, then folded and saddle-stitched.