Winner of the 1994 Augustin-Pyramus de Candolle Prize For Best Monograph in Plant Systematics, this title is monograph 62 of the Flora Neotropica series. In this revision of the tribes Ptychantheae and Brachiolejeuneae in the hepatic family Lejeuneaceae, Gradstein treats 22 New World genera and proposes 11 new names and combinations.