The systematic position of Pachyglossa and Clasmatocolea (Jungermanniopsida: Lophocoleaceae) inferred from nrDNA ITS sequences and morphology

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Abstract:

Maximum parsimony (MP) and maximum likelihood (ML) analyses of 67 nrITS sequences of various genera of the liverwort families Lophocoleaceae and Plagiochilaceae as well as Herbertaceae (outgroup) lead to a fully resolved phylogeny with the separation of Lophocoleaceae and Plagiochilaceae having a bootstrap support of 93 to 99. The monospecific genus Leptophyllopsis is placed sister to the remainder of Lophocoleaceae. Heteroscyphus is found to be monophyletic (ML) or paraphyletic (MP) with Chiloscyphus polychaetus nested in a robust subclade of Heteroscyphus. Leptoscyphus is nested in Chiloscyphus and placed sister to a clade including Chiloscyphus subgenera Chiloscyphus, Lophocolea and Notholophocolea (Chiloscyphus clade I). Chiloscyphus subg. Connati is placed sister to this Leptoscyphus/Chiloscyphus clade. Several accessions of Chiloscyphus, which have also been treated as genus Clasmatocolea are nested in Chiloscyphus clade I. The generitype of Pachyglossa is part of Chiloscyphus clade I and placed sister to Chiloscyphus subg. Notholophocolea. Pachyglossa differs only by its multistratose leaves from Chiloscyphus subg. Notholophocolea. Based on morphological similarities and the outcome of the molecular investigation, Pachyglossa is transferred to Chiloscyphus and Chiloscyphus polychaetus to Heteroscyphus. Five new combinations are introduced.

Keywords: CHILOSCYPHUS; HETEROSCYPHUS; JUNGERMANNIALES; LEPTOSCYPHUS; LIVERWORTS; LOPHOCOLEACEAE; NRITS; PACHYGLOSSA; PHYLOGENY

Document Type: Research Article

Affiliations: 1: Abteilung Systematische Botanik, Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Georg-August-Universität, Untere Karspüle 2, 37073 Göttingen, Germany 2: Institut für Spezielle Botanik mit Herbarium Haussknecht und Botanischem Garten, Friedrich-Schiller-Universität, Philosophenweg 16, 07743 Jena, Germany 3: Abteilung Systematische Botanik, Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Georg-August-Universität, Untere Karspüle 2, 37073 Göttingen, Germany;, Email: jheinri@uni-goettingen.de

Publication date: November 1, 2007

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