The publication of the Loose-Leaf Collection is the continuation of an earlier work of similar content by the ZAG Mammillaria.

Each species is presented on at least 2 leaves (4 pages), with the following informations:

Original description, including the Latin diagnosis, if necessary with translation in German for the foreign language description, with comments, information about the geographical distribution and cultvation tips. The species is illustrated with two colour photographs, one of them a foeld photograph. The illustration of the original description is reproduced, and the seed is generally illustrated with three SEM-photographs