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 miradorensis
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 from 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.
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Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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