This book provides keys, descriptions and illustrations for about 850 species of liverworts and hornworts, in 148 genera and 47 families, of Colombia and Ecuador. The largest genera are Lejeunea (66 spp.), Plagiochila (65), Frullania (54), Radula (33), Metzgeria (33), Cololejeunea (32), Cheilolejeunea (30), Bazzania (26), Drepanolejeunea (25), Ceratolejeunea (18), Diplasiolejeunea (18), and Syzygiella (18). Species descriptions include brief morphological characterization and discussion with emphasis on...