This book is concerned with liverworts and hornworts of the Iberian Peninsula and the Balearic Islands. Biogeographically it covers the Mediterranean and Eurosiberian regions, comprising identification keys to generic and specific level and numerous original illustrations. Each genus includes a short morphological description referring only to the species that appear in the present work. In monospecific genera the species name follows the description; if plurispecific a key to species is given. We recognised 286 species, which represent 68% of the European hepatic flora.