A working checklist of accepted taxa worldwide is vital in achieving the goal of developing an online flora of all known plants by 2020 as part of the Global Strategy for Plant Conservation. We here present the first-ever worldwide checklist for liverworts (Marchantiophyta) and hornworts (Anthocerotophyta) that includes 7486 species in 398 genera representing 92 families from the two phyla. The checklist has far reaching implications and applications, including providing a valuable tool for taxonomists and systematists, analyzing phytogeographic and diversity patterns, aiding in the assessment of floristic and taxonomic knowledge, and identifying geographical gaps in our understanding of the global liverwort and hornwort flora. The checklist is derived from a working data set centralizing nomenclature, taxonomy and geography on a global scale. Prior to this effort a lack of centralization has been a major impediment for the study and analysis of species richness, conservation and systematic research at both regional and global scales. The success of this checklist, initiated in 2008, has been underpinned by its community approach involving taxonomic specialists working towards a consensus on taxonomy, nomenclature and distribution.

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World checklist of hornworts and liverworts.

Input from molecular phylogenetics in the past five years has substantially altered concepts of systematic relationships among liverworts. While these studies have confirmed the monophyly of phylum Marchantiophyta, they have demonstrated that many previously recognised ranks within the hierarchy are unnatural and in need of modification. Changes in the ranks of suborder and above have been proposed by various workers, but modifications in the circumscription of genera and families are still required. A comprehensive, phylogenetic classification scheme that integrates morphological data with molecular hypotheses is presented. The scheme includes diagnoses and publication citations for all names above the rank of genus. All currently recognised genera are listed alphabetically in their respective families; subfamilies are not indicated. Major modifications and novel alignments of taxa are thoroughly discussed, with pertinent references provided. Jungermanniaceae is redefined and Solenostomataceae fam. nov. is formally described to accommodate some of the genera excluded from it.

Phylogeny and classification of the marchantiophyta

Unravelling the phylogeny of Lejeuneaceae (Jungermanniopsida): evidence for four main lineages.

In this checklist all hornworts and liverworts reports for Java are listed. The horn-and liverwort flora of the island consists of 568 known and accepted species (plus 39 invalid or illegitimate names). In addition 12 recorded species are considered dubious and another 111 species are excluded from the flora of Java. Most of the species are reported from West Java. The genus Stenolejeunea is synonymized with Lejeunea and we make the new combination Lejeunea thallophora (Eifrig) Gradst. and the new name Lejeunea propagulifera Gradst. (nom. nov. pro Trachylejeunea schiffneri Herzog; non Lejeunea schiffneri Steph. ex Schiffn.). A new synonym of Lejeunea papilionacea (Cardiolejeunea cardiantha R.M.Schust. et Kachroo syn. nov.) is proposed.

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M. Elena Reiner-Drehwald

Papers

Revision of the genus Crossotolejeunea(Lejeuneaceae, Hepaticae)