Revision of the genus Crossotolejeunea (Lejeuneaceae, Hepaticae)

A revision of the neotropical genus Crossotolejeunea (Spruce) Schiffn. (Lej euneacae) shows that the apiculate leaf apices and ornamented perianths, co nsidered characteristic of the genus, are highly variable and the existence of Crossotolejeunea at genus rank or even as a subgenus of Lejeunea Lib, c annot be sustained. Therefore, the species of Crossotolejennea are transfer red to Lejeunea. A key, descriptions and illustrations for the 15 species r ecognized are provided. Five new combinations [Lejeunea caulicalyx (Steph.) E. Reiner & Goda, L. cristulaeflora (Gottsche ex Steph.) E. Reiner & Goda, L,. cristulata (Steph.) E. Reiner & Goda, L. grossiretis (Steph.) E. Reine r & Goda and L. grossitexta (Steph.) E. Reiner & Goda], one new name (L. er ostrata E. Reiner & Goda, replaced synonym: Crossotolejeunea parva Steph.) and 19 new synonyms are proposed. The genus Dactylolejeunea R. M. Schust. ( Lejeuneaceae) is reduced to synonymy under Lejeunea.