A taxonomic revision of Lejeunea deplanata (Lejeuneaceae, Marchantiophyta) from tropical America

Lejeunea deplanata Nees was not revised since its original description and only few scattered old records were known Study of numerous neotropical collections including type material of Lejeunea Rectolejeunea and Hygrolejeunea species, permitted a redescription of L deplanata The species is characterized by leaf lobes with a widely rounded apex often recurved lobules from 1/4 to 1/2 the lobe length dioicy perianths 5 keeled androecia with bracteoles restricted to the base of the spike and often with caducous leaves Many poorly known taxa namely Lejeunea leucophylla Lindenb, L montana Gottsche, L sabanetica Gottsche (tentatively), L hebetata Spruce, L megalostipa Spruce, Cheilolejeunae fissistipula Steph Rectolejeunea longiloba Steph Pycnolejeunea mu-adorcnsis Steph and Hygrolejeunea paramicola Herzog but also the often cited Lejeunea maxonii (A Evans) X L He are proposed as new synonyms of L deplanata Two species from Mexico Lejeunea chiapae X-L He (= Pycnolejeunea cuspidata Steph) and Hygrolejeunea lanciloba Steph are considered to be conspecific and to represent a variety of L deplanata characterized by leaf lobules with a large tooth at the apex Lejeunea deplanata is at present known horn Mexico Central America (Costa Rica Panama), West Indies (Dominican Republic Jamaica) and South America [Colombia, Venezuela Ecuador (including the Galapagos Archipelago) Peru Bolivia] It occurs between 1200-4000 m except in the Galapagos Island were it is found at 200- 1200 m A description illustrations lectotypifications ecological data discussion on the variability of the species as well as differences to morphologically related taxa are presented