This first part is dedicated to the study of the main characters of the genus Agaricus, the taxonomy and Spanish, Italian and English keys. The work contains the sections Agaricus, Bivelares, Chitonioides, Sanguinolenti (with their subsections Bohusia e Silvatici) and Spissicaulis.
Fungi Europaei Volume 1, part – Agaricus l. also includes four appendices and an excellent iconography with photographs and colour plates. In addition a rich bibliography and a general index are included.