Phylogeny, taxon circumscriptions, and character evolution in the core Ptychanthoideae (Lejeuneaceae, Marchantiophyta)

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Abstract:

Phylogenetic relationships and character evolution in the core Ptychanthoideae (Lejeuneaceae, Marchantiophyta), with a focus on Thysananthus, are assessed based on molecular (plastid psbA-trnH, trnG, trnL-F, trnS-rps4, nrITS), morphological-anatomical, and phytochemical data. Generic relationships are molecularly well-resolved and confirm the placement of Mastigolejeunea pancheri and the monotypic Dendrolejeunea fruticosa in Thysananthus. Most morphological characters currently used to distinguish genera in Ptychanthoideae are homoplastic according to ancestral state reconstruction. Molecular and phytochemical data suggest the occurrence of polyphyletic species in Thysananthus and Mastigolejeunea. Careful study of the polyphyletic taxa revealed morphological differences between some of the intraspecific clades, which correlated with synonymized or novel species. Incongruence between plastid and ITS data in M. pancheri indicated the occurrence of a putative hybrid, the first one recorded in Lejeuneaceae and the first in liverworts inferred from phylogenetic data.

Keywords: H YBRID; LIVERWORTS; MOLECULAR PHYLOGENY; THYSANANTHUS

Document Type: Research Article

Affiliations: 1: Department of Systematic Botany, Institute of Plant Sciences, University of Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany. Current address: Department of Biology, Faculty of Science, Burapha University, 169 Long-Hard Bangsaen Road, Saen Sook Sub-district, Mueang District, 20131 Chonburi, Thailand;, Email: ppsukk@gmail.com 2: Muséum National d'Histoire Naturelle, Dept. Systématique et Evolution, C.P. 39, 57 rue Cuvier, 75231 Paris cedex 05, France 3: Netherlands Centre for Biodiversity Naturalis, section NHN, Leiden University, P.O. Box 9514, 2300 RA Leiden, The Netherlands

Publication date: December 1, 2011

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