2009-01-01
Cactus and Succulent Plant Mall - A general view - grosse Uebersicht - Die deutsche Seite der Kakteen-Mall
Deutsche Kakteengesellschaft - DKG - German Cactus Society
Sukkulentenforum Markus Spaniol - German Succulent Bulletin Board
The Genus of Gymnocalycium - Cactus Home Page by Takashi Shimada
Mark Faint's Cactus page - Many information's about the genus Notocactus
Hybrid Echinopsis Cacti - Hybrid Echinopsis Cacti