Describes 43 spp, 5 varieties and 2 forms in Hygrophorus and 59 spp, 6 varieties and 1 form in Hygrocybe.

There are dichotomous keys to sections and subsections. Each subsection has a key to species followed by an introductory paragraph.

The species accounts (in Italian) are mostly accompanied by line drawings of the microscopy and/or excellent colour photographs.

The iconography consists of 80 plates of paintings (by Aurel Dermek & Ernesto Rebaudengo), each with several illustrations depicting various stages and often a cross-section.

The introductory chapters, the observations at the head of each section, and the keys are given in English translation, otherwise the work is entirely in Italian.