Abstract Detail
Bryological and Lichenological Section/ABLS Shu, Lei [1], Zhu, Rui-Liang [1]. Taxonomy and Phylogeny of Leptolejeunea (Spruce) Schiffn. Leptolejeunea is a pantropical, epiphyllous leafy liverwort genus of Lejeuneaceae, with approximately 50 extant species. Analyses of a molecular dataset including nuclear ribosomal ITS region and two chloroplast regions (trnL-trnF, rbcL), reveal that Leptolejeunea originated during Paleocene, and that a widespread extinction occurred in Leptolejeunea during climate cooling at the Oligocene and Miocene [~23 milion years ago (Ma)]. The monophyletic Leptolejeunea clade forms four lineages, and three subgenera are proposed based on molecular evidence and morphological characters. Three molecular markers (chloroplast trnL-trnF and trnG, nuclear ITS region) were used to explore the circumscription of some ill-defined species. The accessions of the widespread species Leptolejeunea elliptica (Lehm. et Lindenb.) Schiffn., is discovered to be not a monophyletic group but nested with the species from the same origin regions respectively, which suggests that the speciation process might be independent after the mass-extinction event.
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Lei Shu_Leptolejeunea
1 - Plant department, School of life science, East of China Normal University, Dongchuan Road 500, Minhang District, Shanghai, 200241, CHN
Keywords:
Leptolejeunea
Molecular clocks
epiphyllous
ancestral states reconstruction.
Presentation Type: Oral Paper:Papers for Sections
Session: 16
Location: Salon 11/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 4:00 PM
Number: 16010
Abstract ID:147
Candidate for Awards:A. J. Sharp Award | 
